Is Your Dishwasher Hiding Something Nasty? Experts Warn of Common Cleaning Mistakes

Food safety specialists have shared new guidance on how to properly clean a dishwasher, warning that food particles, grease and limescale can build up inside the machine and pose a hygiene risk if left unchecked.

High Speed Training says dishwashers that look clean on the outside can still harbour harmful bacteria and mould, especially in warm, damp areas like filters and seals.

Dr Richard Anderson, Head of Learning and Development at High Speed Training, said: “A poorly maintained dishwasher can become a breeding ground for harmful bacteria and mould, which accumulate in warm, moist areas like filters and seals. This not only leads to unpleasant odours but can also cause blockages, reduce energy efficiency, shorten the lifespan of the appliance, and lead to poor food hygiene.”

Concept maintenance service of home appliances. Worker cleans filter in dishwasher. Male repairman checking food residue filters. S

Key cleaning tips

High Speed Training has set out several steps to keep dishwashers running safely and effectively.

Check the filter weekly:
The filter is the main spot where food debris gathers, often causing bad smells. Regular cleaning helps prevent bacteria from building up.

Run a monthly deep clean:
A maintenance wash every month helps clear hidden grease and limescale. The advice is to run the machine empty on a hot cycle with either a cup of white vinegar placed in a bowl on the top rack or a dedicated dishwasher cleaner.

Use natural cleaning hacks:
A half-cut lemon on the top rack can help break down grease and leave a fresher scent. Sprinkling bicarbonate of soda in the base can also help tackle stains and odours.

Don’t forget hidden areas:
Grease and grime can gather in the rubber door seals and edges. Wiping these spots with warm, soapy water can help prevent mould.

Solve cloudy glasses:
Those in hard water areas may need to use vinegar or a limescale remover more often to prevent cloudy marks on glasses and protect the machine’s heating element.

Dr Anderson added: “Regularly cleaning your dishwasher is a simple process that protects your family’s health and keeps your kitchen running smoothly.

“By following these steps, you’ll get spotless dishes every time and extend the life of your appliance, saving you money in the long run.”

For more tips and in-depth guidance, visit the High Speed Training Hub or read their full article How to Clean a Dishwasher

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