How to Clean Dishwasher After Flooding

Two Types of Dishwasher Flooding

When people search for how to clean a dishwasher after flooding, they usually mean one of two things:

• The dishwasher itself overflowed or leaked during a cycle, flooding the kitchen floor.
• The home experienced a flood (from a burst pipe, storm, or appliance failure) and the dishwasher was submerged or exposed to floodwater.

These are very different situations requiring different responses. This guide covers both.

Situation 1: The Dishwasher Overflowed During a Cycle

Why Dishwashers Overflow

Dishwasher overflow during a cycle is usually caused by too much detergent (especially regular dish soap instead of dishwasher detergent), a clogged drain preventing water from draining, a faulty door latch or seal, or a malfunctioning float switch that controls water level.

Step 1: Stop the Cycle and Disconnect Power

Cancel the cycle immediately and turn off the dishwasher. If water is actively overflowing, turn off the water supply valve under the sink.

Step 2: Remove Standing Water

Use towels, a mop, or a wet/dry vacuum to remove water from the kitchen floor. Dry the floor thoroughly to prevent water damage and mold growth.

Step 3: Clean Up Soap Suds (If Applicable)

If the overflow was caused by too much detergent or wrong soap type, the dishwasher interior will be full of suds. Scoop out as much foam as possible with a cup. Sprinkle baking soda generously over the suds — it breaks down the foam quickly. Run a rinse-only cycle (no detergent) to flush the suds out.

Step 4: Clean the Filter and Drain

Remove and clean the filter — overflow often pushes debris into the filter and drain area. Scrub with a soft brush, rinse thoroughly, and reinstall.

Step 5: Wipe the Interior

Wipe down the interior walls, door, and gasket with a damp microfiber cloth. Run a vinegar cycle to disinfect and deodorize.

Step 6: Identify and Fix the Cause

Before running the dishwasher again, identify why it overflowed. If it was wrong detergent, switch to proper dishwasher detergent. If the drain was clogged, clean it thoroughly. If the door seal or float switch is faulty, have it inspected by a technician before using the machine again.

Situation 2: The Dishwasher Was Exposed to Floodwater

Safety First: Do Not Use Until Inspected

If your dishwasher was submerged in or exposed to floodwater, do not attempt to use it until it has been inspected by a qualified appliance technician or electrician. Floodwater can damage electrical components, contaminate the interior with sewage and bacteria, and create serious safety hazards. This is not a DIY cleaning situation — it's a safety issue.

Step 1: Disconnect Power

Turn off the circuit breaker for the dishwasher before doing anything else. Do not restore power until the appliance has been inspected and cleared.

Step 2: Remove Standing Water and Debris

Once it's safe to enter the area, remove any standing water and debris from inside the dishwasher using gloves and towels. Wear rubber gloves — floodwater is contaminated.

Step 3: Disinfect the Interior

Wipe all interior surfaces with a solution of white vinegar and water (1:1) to kill bacteria and mold. For plastic-tub dishwashers, a diluted bleach solution (1 tablespoon bleach per cup of water) provides stronger disinfection. Wipe thoroughly and allow to air dry completely with the door open.

Step 4: Clean the Filter, Drain, and Spray Arms

Remove and clean the filter, drain basket, and spray arms. Floodwater deposits sediment and debris throughout these components. Scrub thoroughly, rinse, and reinstall.

Step 5: Have the Appliance Inspected

Before restoring power and running the dishwasher, have a qualified technician inspect the electrical components, pump, motor, and control board for water damage. Flood-damaged appliances can have hidden electrical faults that create fire or shock hazards.

Step 6: Run a Full Cleaning Cycle Before Using for Dishes

Once cleared by a technician, run a full hot cycle with an Affresh Dishwasher Cleaner tablet before washing any dishes. Follow with a vinegar cycle and a baking soda cycle to ensure the interior is fully sanitized.

Final Thoughts

A dishwasher overflow during a cycle is usually a quick fix — clean up the water, address the cause, and run a cleaning cycle. A flood-exposed dishwasher is a safety issue that requires professional inspection before use. In both cases, thorough cleaning and disinfection of the interior is essential before returning to normal use.