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How to Clean a Dishwasher: A Step-by-Step Guide
Why It’s Important For You To Clean Your Dishwasher
Your dishwasher performs tirelessly in the background, tackling everything from dried sauce to stubborn grease, but it’s often overlooked that it also requires cleaning. Even if your dishes look clean, your dishwasher could be harboring hidden grime, mineral buildup, or mold that slowly reduces its effectiveness.
Fortunately, you don’t need a professional cleaning service to maintain it. With just a few household supplies and a simple schedule based on how often you run your dishwasher, you can keep it running smoothly and smelling fresh without much effort.
In this article, we’ll break down how to clean dishwasher, how often to clean key parts, show you the best tools and methods, and share practical tips for long-term care. By the time you’re finished, you’ll be able to address any problems you might be experiencing with foggy glasses, odd smells, or just wanting to prolong it.
Table of Contents
- How Often Should You Clean a Dishwasher?
- Why Dishwashers Can Build Up Residue and Biofilms
- Tools & Supplies You’ll Need to Clean a Dishwasher
- Optional Products for Extra Cleaning Power
- Step-by-Step Guide: How to Clean Dishwasher
- Common Dishwasher Problems and What to Check
- Common Dishwasher Mistakes to Avoid
- Maintenance Tips to Keep Your Dishwasher Cleaner & Longer
Jovany Explains: How to Clean a Dishwasher the Right Way
How Often Should You Clean a Dishwasher?
How often you clean your dishwasher depends on how frequently you use it. Regular cleaning is necessary if you use it everyday to avoid accumulation, odors, and decreased performance. If you only use it occasionally, you can clean it less frequently, but you still need to prevent moisture and residue buildup.
Here’s a simple guideline to keep your machine in excellent shape:
| Dishwasher Part | Cleaning Frequency |
| Filter | At least once a week |
| Interior | Once a month |
| Spray arms | Monthly or if you notice dirty dishes |
| Door seal/gasket | Bi-weekly |
| Drain | Every few months or as needed |
A heavily used dishwasher may need attention more frequently. Households running a dishwasher daily or with heavier loads may need to clean the filter as often as every two weeks. Signs that a filter needs attention include dirty dishes, unpleasant odors, visible soil, reduced cleaning performance, or gritty dishes.
Why Dishwashers Can Build Up Residue and Biofilms
A dishwasher is designed to clean dishes, but its interior is also a warm, wet environment repeatedly exposed to food residue, detergent, minerals, changing temperatures, and water pressure.
That combination can leave deposits behind in areas that do not receive the same direct cleaning action as the dishes themselves.
The filter and rubber gasket deserve attention. In a study of household dishwashers, researchers identified diverse bacterial and fungal communities in biofilms collected from dishwasher rubber seals. These microorganisms were able to persist despite the demanding conditions inside dishwashers.
Another study examining dishwasher cleaning cycles found that microbial reduction depended on several factors, including cleaning temperature, cycle duration, and detergent type. In the tested conditions, microbial reduction increased with higher temperatures, longer cycles, and detergent use.
Basically, a normal dishwasher cycle does a lot of work, but it does not eliminate the need to clean the machine itself.
Tools & Supplies You’ll Need to Clean a Dishwasher
Having the right cleaning tools makes the job easier and ensures a more thorough clean that protects your dishwasher in the long run.
Here’s a breakdown of essential supplies and why each one matters:
1. White Vinegar
White vinegar is an acidic cleaner that can help loosen some mineral deposits and residue. However, vinegar is not appropriate for every dishwasher, and repeated use of an acidic cleaner can damage some appliance materials.
Always check your dishwasher’s Use and Care guide before using vinegar.
2. Baking Soda
Baking soda is mildly alkaline and mildly abrasive. It can help with odors and light residue, but it should not be treated as a disinfectant.
Sprinkling it on the dishwasher floor before a short cycle helps eliminate odors and scrub away residue.
3. Dish Soap
Perfect for hand-cleaning racks, filters, and utensil holders. Dish soap effectively cuts through grease and leaves surfaces clean without being harsh.
4. Microfiber Cloth
This soft, lint-free cloth is ideal for wiping down interior walls, door edges, gaskets, and the exterior without scratching surfaces.
5. Old Toothbrush
A soft toothbrush is useful for getting into tight areas around the rubber door gasket, filter crevices, and other small components. Its size and flexibility make it perfect for scrubbing small areas.
6. Soft-Bristle Scrub Brush
This tool is particularly beneficial for larger components such as racks and baskets. It provides the reach and power to remove dried-on food and buildup without damaging coatings.
Avoid wire brushes and abrasive scouring pads on dishwasher filters and other components that can be damaged by aggressive scrubbing.
7. Toothpick or Pin
Essential for unclogging the tiny holes in spray arms, which can become blocked by food particles or mineral deposits. It keeps water flowing freely during cycles.
Optional Products for Extra Cleaning Power
These items aren’t strictly necessary, but they can elevate your routine and provide extra care for specific cleaning needs:
1. Dishwasher-Safe Cleaning Table
A dishwasher cleaner designed for appliance use can help address residue and buildup in areas that are difficult to reach manually. They help keep your machine running smoothly between deep cleans.
Choose a product intended specifically for dishwashers and follow its label instructions. Some manufacturers recommend appliance-specific cleaners as part of regular dishwasher maintenance.
2. Lemon Juice
A natural alternative that adds a fresh scent and enhances the cleaning power of vinegar. Its citric acid helps to break down scale buildup.
3. Stainless Steel Cleaner
If your dishwasher has a stainless steel exterior, a cleaner formulated for stainless steel can help remove fingerprints and surface residue.
Check the appliance manufacturer’s care instructions before applying any product to the exterior.
Step-by-Step Guide: How to Clean Dishwasher
Maintaining the best possible condition for your dishwasher does not have to be complicated. This simple, step-by-step guide will quickly have your machine smelling great and looking clean.
Cleaning the Dishwasher’s Interior
Step 1: Turn Off Power & Empty the Dishwasher
If your dishwasher’s manual recommends disconnecting power before cleaning removable components, unplug the appliance or switch off the appropriate circuit breaker.
Remove all dishes, utensil baskets, and racks so you can reach the interior.
Do not remove or disconnect components that your owner’s manual does not identify as user-serviceable.
Step 2: Clean the Filter
Locate the filter at the bottom of the dishwasher, twist it out, and rinse it under warm, soapy water. Use an old toothbrush to scrub away grease and debris. Rinse thoroughly and let it dry before reinstalling.
The filter matters because it traps food particles and helps prevent debris from being recirculated through the wash system. A clogged or dirty filter can contribute to poor cleaning performance and odors.
Step 3: Clean Spray Arms
Remove the spray arms following your manual’s instructions. Clear out any food particles from the holes using a toothpick or pin. Rinse them under warm water and place them back once clean.
Step 4: Clean the Interior
Before using vinegar or another cleaning product, check your dishwasher’s Use and Care guide.
If the manufacturer permits white vinegar, one manufacturer-supported method is to place vinegar in a dishwasher-safe measuring cup and run a complete cycle without detergent.
If your dishwasher manufacturer recommends a dishwasher-cleaning product instead, use that product according to its label.
Do not assume that a household cleaner is automatically appropriate simply because it is commonly recommended online.
Step 5: Deodorize with Baking Soda
If your dishwasher manufacturer permits baking soda, sprinkle it across the bottom of the dishwasher and run a short hot-water cycle.
Use baking soda separately from vinegar. Do not combine the two as a homemade “deep-cleaning” reaction.
Baking soda is mildly alkaline and abrasive. Vinegar is acidic. Combining them produces an obvious fizz, but that does not mean the mixture is a more powerful dishwasher cleaner. For routine appliance care, the safer approach is to use one product at a time and follow the appliance manufacturer’s instructions.
Step 6: Inspect and Clean the Drain
Remove the bottom rack and visually inspect the drain area for trapped food or debris.
Remove visible debris carefully if your model allows you to access the area. Do not disassemble the pump or drain assembly unless your manual specifically identifies that component as user-serviceable.
If the dishwasher drains slowly after the filter and accessible drain area have been cleaned, check the owner’s manual or contact an appliance professional rather than repeatedly adding cleaning products.
Cleaning the Dishwasher’s Exterior
Step 1: Clean the Door Edges and Gasket
Dip a toothbrush in dish soap or vinegar and scrub the rubber gasket around the door, as well as the door edges. Wipe with a damp microfiber cloth to remove loosened grime and residue.
Step 2: Wipe Down the Control Panel
Use a soft, damp microfiber cloth and a mild cleaner to wipe the control panel gently, buttons, and handle. Avoid spraying cleaner directly on the electronics to prevent damage.
Step 3: Clean the Outer Surface
- Plastic or Painted Surface: Use a cloth dampened with soapy water or all-purpose cleaner to wipe down the door.
- Stainless Steel Surface: Apply a stainless steel cleaner or vinegar-water solution, then buff with a dry microfiber cloth for a streak-free finish.
Step 4: Polish
For stainless steel models, use a polishing cloth or a product made for appliances to keep the finish fingerprint-resistant and shiny.
Optional: Use a Dishwasher Cleaning Tablet
After letting the mixture fizz for about 15 minutes, flush the drain thoroughly with hot water. This final rinse helps to wash away any loosened debris, neutralizes lingering odors, and leaves the drain cleaner and more efficient.
Common Dishwasher Problems and What to Check
Cleaning your dishwasher is easier when you know what a specific problem is pointing toward.
| Problem | Check First | Why It Matters |
|---|---|---|
| Dishwasher smells | Filter, gasket, drain area | Food residue and moisture can remain in less-visible areas |
| Dishes come out dirty | Filter, spray arms, loading pattern | Debris or blocked spray openings can affect water circulation |
| Glasses look cloudy | Mineral buildup, detergent, rinse aid, water hardness | Minerals can leave deposits on glassware |
| Dishes feel gritty | Filter and spray arms | Food particles may not be filtering or washing away effectively |
| Dishwasher drains slowly | Filter and accessible drain area | Food debris can restrict drainage |
| Water remains after a cycle | Drain path and model-specific instructions | The cause may be a clog, pump issue, or drainage problem |
A client might notice that their dishwasher still smells bad even though they run it regularly. When our cleaning team checks the less-visible areas, the filter and gasket can tell a different story, with food residue and buildup hiding where the main tub looks clean.
If cleaning the filter and accessible areas does not solve the problem, avoid repeatedly adding cleaning products. Some dishwasher problems are mechanical or plumbing-related and need a qualified appliance or plumbing professional.
Common Dishwasher Mistakes to Avoid
A. Using Bleach in a Stainless Steel Dishwasher
Bleach may seem like a powerful cleaner, but it can do more harm than good—especially in stainless steel dishwashers. It can corrode internal components, discolor surfaces, and weaken rubber seals. Always opt for dishwasher-safe cleaners specifically designed for the job.
B. Skipping the Filter Clean
Neglecting the filter is one of the most common causes of a smelly and underperforming dishwasher. Over time, food particles and grease collect in the filter, blocking water flow and spreading odors. Cleaning it regularly keeps your dishwasher running smoothly and your dishes coming out spotless.
C. Not Checking Spray Arms
If dishes come out dirty or with residue, the spray arms might be clogged or misaligned. Spray holes can get blocked by food debris or mineral deposits, preventing water from reaching every item. Regular inspection and cleaning ensure optimal water distribution throughout each cycle.
D. Running Only Cold Cycles
While cold water cycles are energy-efficient, they’re not suitable for thorough cleaning. Hot water is crucial for dissolving grease, breaking down detergent, and sanitizing your dishes. Make sure at least one full-hot cycle is part of your routine to maintain hygiene and performance.
E. Ignoring the Gasket and Drain
The rubber gasket around the door and the drain at the bottom of the tub often go unnoticed, but they’re magnets for mold, grime, and food scraps. Ignoring these areas can lead to unpleasant smells and even mechanical issues. A quick wipe-down and drain check every couple of weeks can make a big difference.
Maintenance Tips to Keep Your Dishwasher Cleaner & Longer
Regular maintenance not only improves cleaning performance but also helps prevent breakdowns and extends the life of your appliance. These detailed tips go beyond the basics to help you get the most out of your dishwasher.
A. Scrape, Don’t Rinse
Instead of fully rinsing dishes, scrape off large food particles before loading them.
Dishwashers are designed to handle food residue, and manufacturer guidance commonly recommends scraping rather than fully pre-rinsing. KitchenAid specifically advises removing large food particles without washing or rinsing dishes before loading.
Some modern dishwashers also use soil-sensing systems to adjust aspects of the wash cycle, so excessive pre-rinsing is not necessarily helpful.
B. Run Hot Water Before Starting
Before starting a wash cycle, turn on the hot water at your kitchen sink and let it run for a few seconds.
Starting with hot water can help the dishwasher reach its intended operating conditions sooner, but the appliance’s programmed cycle and manufacturer’s instructions remain the priority.
C. Leave the Door Ajar After Each Cycle
After the dishwasher finishes a cycle, leave the door slightly open to let excess moisture escape. By doing this, you can speed up the drying process, avoid condensation, and lessen the likelihood that mold and mildew will grow inside.
D. Don’t Overload the Dishwasher
Resist the temptation to cram in every dish.
Overloading can block spray arms and prevent water from reaching surfaces effectively. Leave enough space for water to circulate around dishes and allow the spray arms to rotate freely.
E. Use Rinse Aid
To combat limescale buildup, especially in hard water areas, use a rinse aid. It helps wash dishes and prevents mineral deposits on glassware and inside components. In areas with very hard water, consider using a water softener or dishwasher tablets formulated for hard water protection.
F. Consult Your User Manual
Dishwashers vary by model, and some have specific maintenance requirements.
Check your manual for instructions on:
- Removing and cleaning filters
- Removing spray arms
- Cleaning the interior
- Using vinegar or other cleaners
- Using dishwasher-cleaning products
- Caring for stainless steel
- Cleaning or checking the drain
- Running maintenance or cleaning cycles
Some brands also include internal diagnostics or cleaning reminders that you might not be aware of.
G. Address Common Problems Promptly
If you notice a leaky door seal, check for debris around the gasket or consider replacing the seal if it’s cracked. For slow drainage, inspect the filter and drain area for clogs before assuming there’s a plumbing issue.
Addressing these small issues early can prevent larger repairs later.
Key Takeaways
Keeping your dishwasher clean is more than just routine maintenance. It is essential for ensuring efficiency, preventing breakdowns, and extending the life of the appliance. Regular tasks such as unplugging the machine, cleaning the racks, spray arms, and filter, and using natural cleaners like white vinegar and baking soda help remove grease, residue, and buildup. It is also important to pay attention to areas like the door gasket and the drain, where grime and bacteria often collect unnoticed.
Once your dishwasher is clean and you’re feeling a little bit motivated, it might be the perfect time to expand your efforts to the rest of the kitchen. To help you get started, check out our guide on where to start cleaning first for a clear, step-by-step approach.
Incorporating simple habits like leaving the door slightly open after each cycle, using a rinse aid to reduce water spots, and avoiding overcrowding can significantly improve your dishwasher’s performance.
And when a deeper clean is needed, Roochii Cleaning in Denver offers reliable, professional services to help keep your kitchen running smoothly. A little regular care, paired with expert support when needed, can make a big difference in the long-term performance of your dishwasher.
