Quick answer
To clean a dishwasher, start by removing debris from the filter and spray arms, then run a cleaning cycle with a dishwasher cleaner or a cup of white vinegar. Regular monthly maintenance prevents odors and buildup.
Learning how to clean a dishwasher is a key part of kitchen equipment maintenance that often gets overlooked. A clean machine doesn’t just look better—it cleans your dishes more effectively, runs more efficiently, and lasts longer. Over time, food particles, grease, and mineral deposits from hard water can build up inside, leading to unpleasant smells and poor performance. This guide will walk you through the simple steps to restore your dishwasher’s sparkle and keep it running smoothly.
Why Regular Dishwasher Cleaning is Essential
Your dishwasher works hard, but it can’t clean itself. Food scraps, soap scum, and minerals from water gradually accumulate on the filter, spray arms, and interior walls. This buildup can clog the small holes in the spray arms, reducing water pressure and leaving dishes dirty. It can also create a breeding ground for mold and mildew, which is a common source of that musty odor many people notice. The U.S. EPA notes that controlling moisture is fundamental to preventing mold growth in the home. Regular cleaning prevents these issues, ensures your dishes are sanitized, and helps your appliance operate at peak efficiency, which can conserve water and energy. Think of it as routine care, similar to maintaining your oven or other kitchen appliances.
Step-by-Step Guide to Cleaning the Interior
Before you begin, always check your owner’s manual for specific instructions or warnings for your model. Start by removing the bottom rack to access the dishwasher’s floor and filter area. Use a damp microfiber cloth or a soft brush to wipe down the interior door seals, edges, and the inside of the door, where grime often collects. For the tub walls, a simple wipe with the cloth is usually sufficient. Avoid using abrasive pads or harsh scrubbers that could damage the stainless steel or plastic surfaces. For a deeper clean, you can proceed to run a cleaning cycle, which we’ll cover in the deodorizing section. This process is a cornerstone of overall kitchen cleaning equipment care.
How to Access and Clean the Filter and Spray Arms
The filter and spray arms are the heart of your dishwasher’s cleaning system, and keeping them clear is the most important part of learning how to clean a dishwasher.
Cleaning the Filter
Most dishwashers have a filter assembly at the bottom of the tub, under the lower spray arm. Twist or unlock it according to your manual’s instructions and lift it out. Rinse the filter under warm running water, using a soft brush to dislodge any stuck-on particles. Some filters have multiple parts that can be separated for a more thorough cleaning. Reassemble and replace it securely.
Cleaning the Spray Arms
Unscrew or unclip the upper and lower spray arms. Check all the small spray holes for blockages from seeds, glass fragments, or mineral scale. You can use a toothpick or a small brush to clear them out. Rinse the arms thoroughly under water and shake them to ensure water flows freely through all holes before reattaching them. A clogged spray arm is a leading cause of poorly cleaned dishes.
What to look for
- Filter Type: Know if your filter is self-cleaning, manual, or a combination. Manual filters require regular attention.
- Spray Arm Rotation: After cleaning, spin the arms by hand to ensure they move freely without obstruction.
- Debris in the Bottom: Always check for and remove large food chunks or objects from the sump area before running a cycle.
Descaling and Addressing Hard Water Buildup
If you live in an area with hard water, white, chalky mineral scale (limescale) can coat your dishwasher’s heating element, interior, and components. This reduces heating efficiency and can leave spots on glassware. Dishwasher descaling is the process of removing this buildup. You can use a commercial dishwasher cleaner formulated to dissolve limescale, following the product’s label instructions precisely. As a natural alternative, placing a cup of white vinegar in a dishwasher-safe bowl on the upper rack and running a hot water cycle can help break down mild mineral deposits. Never pour vinegar directly into the detergent dispenser or mix it with bleach or other cleaning chemicals.
Deodorizing and Preventing Future Buildup
A smelly dishwasher is usually a sign of trapped food or microbial growth in moist, warm areas. After cleaning the filter and spray arms, running a deodorizing cycle is effective. Use a dishwasher cleaning product or the vinegar method mentioned above. To prevent odors, get in the habit of rinsing large food scraps off dishes before loading, and run your dishwasher regularly rather than letting dirty dishes sit. After a cycle, leave the door slightly ajar for an hour to let the interior dry completely and prevent mold. This simple step is a powerful part of ongoing dishwasher maintenance.
Safety
Always disconnect power or ensure the dishwasher is turned off before accessing internal components like the filter. Never mix cleaning chemicals (e.g., vinegar and bleach), as this can create dangerous fumes. Follow all safety warnings on commercial cleaner labels. For questions about chemical safety, contact Poison Control. Check CPSC recalls to see if your appliance model has any safety notices.
Monthly and Quarterly Maintenance Checklist
Incorporate these tasks into your routine to keep your dishwasher in top shape. A consistent schedule makes the job quick and easy.
| Frequency | Task |
|---|---|
| After Each Use | Wipe door gasket and edges; check for large debris in the bottom. |
| Monthly | Clean the filter and spray arms; wipe down the interior door and seals; run a cleaning/deodorizing cycle. |
| Quarterly | Perform a thorough descaling treatment if you have hard water; inspect spray arms for wear or damage. |
| As Needed | Check and clean the detergent dispenser; ensure drain hose is not kinked. |
This proactive approach to equipment cleaning helps avoid larger problems down the road.
FAQ
How often should I clean my dishwasher?
We recommend a basic cleaning of the filter and interior about once a month. If you use your dishwasher daily or have hard water, you may need to clean it more frequently. Running a deodorizing or descaling cycle monthly can also help maintain performance. Always refer to your manufacturer’s manual for their specific maintenance schedule.
Why does my dishwasher smell and how can I fix it?
A persistent musty or sour smell is typically caused by food particles trapped in the filter or slime buildup in the sump or on spray arms. To fix it, first clean the filter and spray arms thoroughly as described above. Then, run a hot water cycle with a dishwasher cleaner or a bowl of vinegar on the top rack. Prevent future smells by scraping plates before loading, cleaning the filter monthly, and leaving the door open after cycles to dry.
Can I use bleach to clean my dishwasher?
While some manufacturer manuals may mention diluted bleach for disinfecting, we advise caution. Bleach can corrode stainless steel tubs, damage rubber seals and gaskets over time, and is hazardous if mixed with other cleaners like vinegar or ammonia. For routine cleaning and deodorizing, dedicated dishwasher cleaners or vinegar are safer, effective choices. Always follow your appliance manual’s guidance.
What should I do if my dishwasher isn’t cleaning dishes well?
Poor cleaning is often a maintenance issue. First, check and clean the filter and spray arms for clogs. Ensure you’re using the correct type and amount of detergent. Check that the water temperature is hot enough by running the hot water at your sink before starting a cycle. If problems persist after basic maintenance, the issue could be with the water inlet valve or pump, and you should consult the manufacturer or a qualified appliance technician.
References
- Manufacturer manuals and specification sheets: For model-specific maintenance and safety instructions.
- U.S. Environmental Protection Agency (EPA): Mold prevention guidance.
- Poison Control: Chemical safety information.
- U.S. Consumer Product Safety Commission (CPSC): Product recall database.
