Stop defaulting to vinegar when you clean the dishwasher

Search for how to clean a dishwasher and the top answer is always a cup of white vinegar on the top rack. It genuinely does dissolve limescale — but it's also the one cleaner that several dishwasher manufacturers specifically warn against, and the reason is sitting in your machine's door.

The acid and the rubber

A dishwasher is a gasket machine: rubber or silicone seals around the door, the pump, the spray-arm bearings and the hoses. Vinegar's active ingredient is acetic acid, and Bosch and Electrolux are among the manufacturers who warn that repeated acid exposure degrades the rubber compounds in their machines — the seals stiffen, crack or swell, and a failed door gasket or pump seal leaks. As one chemist put it in Consumer Reports' coverage of vinegar cleaning: there are dozens of rubber formulations, some react with vinegar and some don't, and unless your manual says vinegar is fine, you're running an experiment on your own appliance.

Frequency is the whole difference

An occasional vinegar rinse is very unlikely to hurt a machine whose manual doesn't forbid it. The damage case is cumulative — the "clean it weekly with vinegar" routine, vinegar left in as a soak overnight, or vinegar substituted for rinse aid in the dispenser, which sits concentrated against the dispenser's seals between cycles. If you wouldn't run the experiment on a £600 machine, don't run it monthly.

What to use instead

For routine care, the machine's own heat does most of the work: run it hot and empty, with a dedicated dishwasher cleaner or a dishwasher-safe cleaner tablet, every month or two. For the parts that actually collect grime, nothing beats mechanical cleaning — rinse the filter under the tap weekly, wipe the door seal lip and the spray-arm holes with an old toothbrush, and clear the arm jets with a cocktail stick. Hard-water scale on the tub wipes off with a paste of bicarbonate of soda, which is mildly alkaline and gasket-safe.

The same rule everywhere in the house

Vinegar's reputation comes from being brilliant on mineral scale — kettles, shower heads, glass. The lesson isn't "vinegar bad"; it's that acids and rubbers are a bad pairing anywhere in the home. It's the same reason the cleaning-safety shelf exists: never mix cleaning products, more detergent isn't more clean, and washing machines deserve the same gasket respect — the internet's vinegar-and-bicarbonate routines are hard on front-loader door boots for exactly the same reason.

Sources: Bosch and Electrolux cleaning guidance as reported by Consumer Reports (2020); InSinkErator and manufacturer care documentation for adjacent appliances. Reviewed September 2026.