What can’t be put in a dishwasher

The following items cannot go into a dishwasher: antique dishes, wooden kitchen equipment, cast iron pan, copper, crystal, good chef's knives, thermos items, disposable plastic containers, disposable plastic packaging, anything with stickers or other sticky things, etc.

What can’t be put in a dishwasher



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A wash geek since 2017

Antique tableware

If you have some beautiful tableware somewhere, it’s best not to put it in the dishwasher. The decorations that are painted on the porcelain can’t withstand the heat of the dishwasher and the chances are that they will slowly fade. Cups, plates and other tableware invented for the dishwasher are better washed by hand!

Wooden Kitchenware

A wooden cutting board is beautiful and functional, but you cannot wash it in the dishwasher. Wood is not good in combination with a lot of moisture and heat and will splinter after a while.

This applies not only to wooden cutting boards, but also wooden spoons, things with wooden handles and other kitchen utensils made of wood.

Cast iron pans

A cast iron pan has a layer of oil on the inside that prevents the pan from rusting on the inside. Once you wash the pan in the dishwasher too often, this layer will wear off, causing the pan to rust.

This also applies to ceramic pans and any other items that have a non-stick coating. If you put them in the dishwasher too often, the protective layer will slowly deteriorate. The result is that your food will stick to the inside of the pan. So wash by hand!


This type of metal was in fashion again a while ago, so there is a chance that you have copper pans or cutlery. Do not put them in the dishwasher because they will lose their color! Hand washing is best for these products. This also applies to aluminium and tin! Not only because of the heat, but also when putting them in and out, there is a chance that you accidentally break them. After a while, crystal can also lose its luster from the dishwasher.

Good chef’s knives

It may be a little obvious, but your quality chef’s knives should absolutely not be put in the dishwasher. They can get rusty or blunt and that is of course not what you want. Besides that knives don’t need to be cleaned for a long time.

Thermos items

This is a tricky item, because if there is a dishwasher symbol on it, your thermos or cup may go into the dishwasher. Is there no such symbol? Then it’s best to wash it by hand. If he is not against the hot water of the dishwasher there is a chance that the insulating layer of air disappears, so he loses his function.

Disposable plastic containers

For example, if you want to keep a container and do something else with it, it is a good idea and environmentally friendly. That’s a good and environmentally friendly idea, but if you put it in the dishwasher it won’t do you any good. You also have to be careful with hard plastic containers. The heat from your dishwashers will cause stickers and other items stuck to them to come off easily. Not only is this bad for your dishwasher, chances are you will find the sticker on another item in your dishwasher.

You only make that mistake once

There are quite a few things that should not go into the dishwasher, and often you only find out when it goes wrong. If you have a lot of things that can’t go in the dishwasher, you can console yourself that you only need a small dishwasher!

Picture of Yannick

A wash geek since 2017

Our research