White film can be hard-water mineral, excess detergent or undissolved detergent—not necessarily food soil. Whether vinegar dissolves a sample helps distinguish mineral from etching, but follow material and manufacturer limits. Rub a spot with your thumb; if it wipes away or dissolves in a dilute vinegar soak, it is mineral film.
What this covers
- Dishwashers · wash quality
What it does not cover
Differential
Likely causes of “Dishwasher leaves a white film on dishes”, and how to tell them apart
- 1
Hard-water minerals are being left on the dishes
What separates it A chalky, cloudy film that wipes off with a damp cloth and is worse on glasses and dark plastic, in an area with hard water.
How to confirm Rub a spot with your thumb; if it wipes away or dissolves in a dilute vinegar soak, it is mineral film.
- 2
Too much detergent or detergent that is not dissolving
What separates it A powdery or slimy film, often heaviest on the lower rack and inside cups, especially with an oversized dose.
How to confirm Compare the amount used with the pack's dose and check the water temperature at the start of the cycle.
- 3
The rinse aid is empty or set too low
What separates it Streaks and spots on every load and dishes that stay wet after drying.
How to confirm Check the rinse-aid reservoir and the dose setting, and refill if it is low.
- 4
The glass has etched permanently
What separates it A rainbow or cloudy haze that no soak or cleaner removes, on glasses run many times with soft water and heavy detergent.
How to confirm Soak one glass in dilute vinegar; a haze that stays afterwards is etching and cannot be reversed.
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the film wipes off, feels gritty or is a permanent cloudy haze.
- The local water hardness, the detergent type and the dose used.
- The rinse-aid level and setting, and whether a softener or salt is used.
Try in this order
0 of 4 completedObserve before changing anything
ReversibleRub a spot and note whether it is chalky, gritty or permanently cloudy.
Isolate the failing boundary
ReversibleCheck water hardness, rinse-aid setting, detergent type and incoming hot-water temperature.
Apply the narrow correction
ReversibleAdjust measured detergent and rinse aid and run the manufacturer-approved cleaning cycle.
Verify the result and stop at the boundary
ReversiblePermanent glass etching will not wash away; do not keep increasing detergent.
Stop boundary
When this stops being a self-service repair
- !Permanent glass etching will not wash away, so stop increasing the detergent dose, which only makes it worse.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Can I use vinegar to remove white film?+
White vinegar can dissolve mineral film on glass, but follow your manual for what may go through the machine, keep it away from rubber seals for long periods and never mix it with bleach.
Is it hard water film?+
Vinegar dissolves mineral film but not detergent residue.
How do I test it?+
Soak in vinegar; if it clears, it is mineral.
What helps hard water?+
Rinse aid and a softener setting.