What Cannot Go in the Dishwasher? – 12 Things Can’t be Washed

What Cannot Go in the Dishwasher? – Things That You Can’t Wash in the Dishwasher. A dishwasher is one of the most convenient benefits of civilization, invented recently. But kitchen utensils are impossible to wash in the dishwasher, as the dishes can deteriorate.

The following factors affect the dishes placed in the dishwasher:

  • The temperature range of water is +50-+75 C.
  • Means aggressive action.
  • Drying occurs only with hot air.
  • The moisture acts for a long time (for some modes, the soaking duration is 2 hours).

At the same time, some kitchen utensils will endure the impact of all these factors, while others, on the contrary, will quickly deteriorate from special chemicals or high temperatures, so you need to focus on the marks on the dishes.

What Cannot Go in the Dishwasher?

The list of items that can deteriorate from washing in the dishwasher include:

1. Dishes or kitchen utensils

Dishes or kitchen utensils contain natural oils. So, it will be best if you do not soak wooden dishes because the tree will swell and lose shape. If you need to disinfect dishes, it is better to use ready-made substances specially designed for such dishes.

2. Aluminum products

After loading aluminum dishes into dishwashers, you will notice that they will become dark and dull after such treatment. The same story can happen with baking sheets and pot pans made of aluminum. Alkaline detergents can cause white spots on aluminum products.

3. Cast iron items

Many homemakers prefer to use cast iron pans in the kitchen, which are almost eternal, but only if properly cared for. To prevent food from sticking in such a pan, you must first grease it with oil, then a special film for cooking appears on it.

Dishwashing machines use an aggressive detergent, making them unusable. The same fate awaits cast-iron utensils, which have an enamel coating. If a fat coating has appeared in the pan, it is better to get rid of it by washing it with your hands.

4. Knives

You should not wash these items because they easily damage the protective coating on the baskets and coasters. Also, after such processing, they can begin to rust. They are also dangerous when unloading dishes, especially if children will unload the dishes. The knife may lose its sharpness from a special cleanser, and the wooden handle may even crack. For this reason, it is better to wash knives by hand.

5. Copper products

Mugs or pans made of copper, in order not to lose their original appearance, it is better to keep the shine away from the dishwasher. Using it destroys the upper protective layer, and copper is corroded. This process is irreversible. Contraindicated for washing in the dishwasher and objects made of copper. The fact is that the dishwasher uses a very aggressive detergent that can discolor copper products.

6. Gilded items

All dishes treated with gilding should not be sent to the dishwasher for washing but straight to the sink. Aggressive detergents in the car dishwasher are ready to absorb the entire gilded surface mercilessly, and the thing will lose its value. It is possible to preserve the life of gilded objects only if the obligatory rules for their operation and care are observed.

7. Items made from milk glass

Choosing a dishwasher for washing will quickly be disappointed because this will quickly turn yellow. And all this is due to the high processing temperature and strong detergents used for dishwashers. For this reason, it is advisable to wash them with your hands.

8. Frying pans with a non-stick finish

Many non-stick pans are allowed to be washed in the dishwasher, even when using high temperatures and aggressive detergents. If cracks and chips appear in the pan, then during cooking, dangerous toxins will penetrate the food.

9. Containers, glasses, insulating glasses

Cups made of plastic and metal perfectly preserve food (for example, cold food stays cold for a long time). Even if there is an inscription on such dishes that they are washed in a dishwasher, you should not do this because the hermetic gasket may deteriorate from such cleaning, and moisture will penetrate the air gap.

10. Crockery with various patterns, images, and hand-painted

Due to the peculiarities of printing on porcelain, glass, and some kitchen utensils, it is impossible to wash in a dishwashing machine because a strong stream of water can wash off the paint in just a few washes. And it is forbidden to wash painted dishes in such units.

11. Thermoses

The influence of a jet of hot water can damage the insulation – and the Thermo mug will turn into a regular mug. Although on some models of thermoses, there are marks that allow you to wash them in the dishwasher after disassembling them.

12. Wooden appliances

Wood cutting boards, chopping boards, and other kitchen utensils and utensils made of wood need a more delicate finish – especially if their surface is varnished. From exposure to hot water and steam, such a coating will begin to burst and eventually “peel off.” In addition, drying under the pressure of air leads to the appearance of cracks and irregularities.

Is It Possible to Wash Plastic Dishes in the Machine?

One of the most common questions that users of the dishwasher have is whether it is possible to wash plastic dishes. And in this case, the answer is ambiguous. You can only use the dishwasher if the item is made of plastic, such as PET (PET) or food-grade propylene (PP).

By marking, you can verify that the material belongs to one of these categories. Sometimes a special sign is placed at the bottom of plastic plates, containers, and trays, allowing washing in a dishwasher.

If machine washing is contraindicated, it will cross out the drawing. If there are no markings, you should pay attention not only to the inscriptions PET and PP but also to the thickness of the walls – the stronger the dishes, the more likely they will survive washing in automatic mode.

Items That You Can Wash Under Certain Conditions

Along with the dishes you can or cannot wash in the dishwasher, you can clean some items under certain conditions.

So, cupronickel products can be placed in the dishwasher – but only separated from other cutlery. If dishes are being cleaned, they can be placed in the compartment after removing the handle with a thermometer, which can be damaged by jets of hot water.

You can also wash plastic kids’ toys in the dishwasher. And in this situation, it’s crucial to keep in mind at least two conditions:

  • Production material PP or PET plastic,
  • Toys should not have small glued items that can clog the drain filter or damage the pump.
  • Do not wash dishes in the dishwasher made from a suitable material or a container with falling-out rubber bands, stickers, and labels. Loosened parts lead to clogging of the filter and sprinkler nozzles.

Sometimes on the Web, there are tips on washing items that are not entirely intended for this in the dishwasher. For example, exhaust and ventilation filters, sports equipment, caps, and brushes from a vacuum cleaner.

But, if such a need arises, you should remove all hair and debris from the surface of the washed objects.

At the same time, the machine is suitable for washing vegetables and fruits. They must be evenly distributed in the basket and processed using the rinse function without adding detergents.


Using our tips, you can buy your kitchen dishwasher and use them for a very long time. You will find a good selection of dishwashers on the TheKitchenBest.com website at a good price like dishwasher for you family for under $400, Under $600 or Under $1000 and with a convenient review.