How to Clean a Dishwasher: Easy Step-by-Step Guide

Step-by-Step Guide: How to Deep Clean a Dishwasher

Follow these detailed steps to completely refresh your machine from the inside out.

1. Empty the Dishwasher and Remove the Racks

Start with a completely empty machine. Pull out the bottom rack and set it aside to give yourself clear access to the bottom basin and the drainage area. If your top rack is easily removable, take it out as well to inspect the spray mechanisms.

2. Clean the Dishwasher Filter

The filter is the most common source of foul odors and drainage problems. Most modern dishwashers have a manual filter located in the bottom basin under the lower spray arm.

• Unlock the cylindrical filter by twisting it counter-clockwise, then lift it out gently.
• Remove the flat metal or plastic screen underneath if your model has one.
• Rinse the filter components under warm running water to flush away loose residue.
• Use a soft toothbrush and warm soapy water to scrub away trapped grease, calcium deposits, and stuck-on gunk.
• Check the filter housing in the base of the machine for stray bones, glass shards, or plastic tags, then lock the clean filter back into place.

3. Inspect and Unclog the Spray Arms

Water cannot clean your dishes if the spray arm nozzles are blocked by limescale or food matter.

• Inspect the small holes along the upper and lower spray arms.
• Use a toothpick or a straightened paperclip to gently dislodge any trapped debris from the holes.
• If your spray arms are removable, unclip them and rinse them under hot tap water to clear internal blockages.

4. Run a Hot Vinegar Cycle

White vinegar is a natural acid that cuts through built-up grease and dissolves chalky limescale deposits.

• Place a dishwasher-safe bowl filled with one to two cups of distilled white vinegar right-side-up on the top rack.
• Ensure the rest of the dishwasher is empty and do not add any detergent.
• Select the hottest and longest wash cycle available on your machine (such as a Heavy or Pots and Pans cycle).
• Run the cycle completely to allow the vinegar to circulate, steam, and sanitize the interior walls.

5. Run a Baking Soda Cycle

After the vinegar cycle finishes and the interior cools, it is time to deodorize and polish the interior tub.

• Sprinkle one cup of baking soda evenly across the entire floor of the dishwasher.
• Run a short, high-heat wash cycle.
• The baking soda acts as a mild abrasive to remove lingering stains and balances the pH to leave the machine smelling fresh.

6. Wipe Down Door Seals and Exterior Surfaces

The rubber gaskets and edges around the door never get hit directly with water during a wash cycle, making them a prime breeding ground for black mold and slime.

• Dip an old toothbrush into warm, soapy water and gently scrub the rubber door seals and crevices.
• Wipe down the sides and top edge of the door where steam escapes and collects grime.
• Dry the seals thoroughly with a clean microfiber cloth.
• For stainless steel exteriors, wipe along the grain with a damp microfiber cloth and a drop of dish soap, followed by a dry cloth to prevent streaks.

How to Deal with Stubborn Mold and Mildew

If you notice persistent black mold inside a plastic tub dishwasher, you can run a sanitizing cycle with one cup of liquid chlorine bleach poured into the bottom basin. However, never use bleach in a dishwasher with a stainless steel interior or stainless steel parts, as bleach corrodes and discolors the metal permanently. For stainless steel tubs, stick with white vinegar and hot steam.

How Often Should You Clean Your Dishwasher?

Maintaining a consistent cleaning routine keeps your appliance running efficiently and prevents severe buildup:

• Daily: Scrape large food scraps off plates before loading; remove visible debris from the bottom tub.
• Weekly: Wipe down the door edges, rubber gasket, and control panel.
• Monthly: Remove and rinse the filter, and run a vinegar and baking soda deep clean.
• Quarterly: Inspect spray arms for clogs and deep clean the drainage assembly.

Tips to Keep Your Dishwasher Fresh Between Cleanings

Small daily habits make a big difference in appliance performance. Always run cold tap water briefly before starting your garbage disposal, and run your kitchen sink hot tap until the water is hot before starting your dishwasher cycle. This ensures the cycle begins with maximum cleaning temperature. Additionally, leave the dishwasher door cracked open an inch after unloading to allow trapped humidity to evaporate, preventing mold growth.

Conclusion

Knowing how to clean a dishwasher ensures your dishes come out completely clean, spot-free, and sanitized every time. By establishing a monthly routine using affordable household ingredients like white vinegar and baking soda, you eliminate stubborn odors, optimize energy efficiency, and protect your investment for years to come.