What You Can’t Wash in the Dishwasher and Why: Prohibited and Permitted Types of Dishes

The dishwasher is a handy helper for every housewife. Its use can make life much easier, or it can bring only problems and frustrations.

What you shouldn’t wash in the dishwasher and why – a list

There is a whole list of items that by no means should be washed in the dishwasher. If you ignore the prohibitions, it will either lead to a breakdown of the equipment, or to the deterioration of plates and cups.

So, in the dishwasher it is strictly forbidden to wash kitchen utensils made of:

  • wood – cutting boards, plates, spoons, spatulas, and other items can crack and deform, as well as “burst” from high temperatures;
  • porcelain – the unique patterns on the porcelain dishes from grandma’s service will fade over time, but this does not apply to modern porcelain products;
  • aluminum – because of detergents and high temperatures on the surface of aluminum appliances it forms black residue, which then is not easy to get rid of;
  • cast iron – dishwasher detergents cause rust on cast iron and reduce product durability;
  • crystal – fragile material can be clouded by aggressive detergents, and the mechanical effect of dishwashing will cause chipping and cracking.

It is strongly not recommended to wash kitchen knives in the dishwasher – it makes them lose their sharpness, and the products themselves may damage the parts of the dishwasher.

Dishwasher manufacturers warn that if you need to get rid of cinders or stale grease, it is better to do it manually, otherwise, the filters of kitchen appliances will clog.

Kettles, mixers, steamers, and any other electrical appliances are also best cleaned by hand to avoid damaging wires and electrical circuits.

Can I wash the tray in the dishwasher and other items

These include:

  • plastic dishes – food containers, plates, knives and forks, glasses, cutting boards, and any other items made of plastic;
  • stainless steel cookware – pots, pans, sauté-pans, thermoses, cutlery, etc;
  • Ceramic tableware – pots, cups, plates, and other items will stay safe after dishwashing;
  • glassware – any glassware will not get cloudy and will be clean – just place it well away from dishwasher walls.

You can also wash trays, juicers, silicone, ceramic, and glass baking forms in the dishwasher. Some housewives even use the dishwasher to clean fruits and vegetables (without using detergent, of course), as well as wash kitchen sponges, brushes, and towels.

In any case, you can determine for yourself whether your dishes can be washed in the dishwasher – there should be a pictogram sign on the back of the product.

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Written by Emma Miller

I am a registered dietitian nutritionist and own a private nutrition practice, where I provide one-on-one nutritional counseling to patients. I specialize in chronic disease prevention/ management, vegan/ vegetarian nutrition, pre-natal/ postpartum nutrition, wellness coaching, medical nutrition therapy, and weight management.

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