Symptoms
- Gritty or powdery residue visible on the tub floor or door
- Residue distinct from food debris
- Problem more common with certain detergent brands
- Coincides with hard water in the home
Likely causes
- CommonDetergent not fully dissolving due to cold waterJust as with dishes, insufficient hot water at the start of the cycle leaves undissolved detergent behind.
- CommonHard water mineral buildup combining with detergent residueMinerals bind with leftover detergent to form a visible gritty film.
- PossibleUsing more detergent than neededExtra detergent beyond what dissolves and rinses away just becomes residue.
- Less commonSpray arm not distributing water evenly to rinse the tub wallsCertain areas of the tub may get less rinse water than others.
What to do
- Run the hot water at the sink until steaming before starting the dishwasher.
- Reduce the amount of detergent used per load, especially with concentrated pods, following the package's recommended amount.
- Run an empty cleaning cycle with a dishwasher cleaner or a cup of vinegar to dissolve existing residue buildup.
- Wipe down the door interior and tub walls by hand periodically to prevent buildup from accumulating.
- Check the spray arms for clogs that might be reducing rinse coverage on the tub walls.
- If residue keeps appearing even with proper detergent amounts and hot water, consider a water softener for ongoing hard water.
Tools and parts
- Damp cloth
Dishwasher cleanerSearch: “dishwasher tub cleaner”
When to call a pro
This is a maintenance issue rather than a repair; no professional visit is typically needed.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.