10 Items To Never Put In Your Dishwasher

Most of us have come to rely on our dishwashers so much that we rarely even consult our owner’s manuals anymore. But when it comes to dishwashers, the action of the water and the harsh chemical makeup of dishwasher detergents mean that some items won’t fare well being washed in that environment. In fact, most of us make some of these mistakes frequently. Here are some things you should NOT wash in your dishwasher.

Your Good Knives

Any home chef worth their salt has some good knives. But these are not meant to go through the heavy dishwasher action. Your good knives will dull and those with wooden handles may come apart. Hand wash all your good chef’s knives in order to keep them sharp and in good condition.

Cookware with Nonstick Coating

Yes, you probably have been doing this since the advent of Teflon. But even modern nonstick cookware is better off being hand washed. Most manufacturers suggest handwashing for good nonstick cookware.

Wooden Kitchen Utensils

Wood and water have never been happy bedfellows. Although you may not care about a set of cheap wooden spoons, any wooden kitchen tools, cutting boards, or bowls take a real beating in the dishwasher and can eventually dull, warp, and splinter.

Aluminum Products

Although it’s true that some aluminum kitchen products are marked dishwasher safe, aluminum is especially prone to scratching and discoloration. You’re better off hand washing your aluminum ware.


Copper cookware, pans with copper bottoms, or copper mugs are just not meant for the dishwasher. Copper will become discolored and dull over time, ruining that beautiful finish.

Insulated Cups and Mugs

Cups and mugs that are designed to be insulated have a seal between the outer and inner layer. The heat and intensity of the dishwasher may cause water to leak into that seal and ruin the insulating quality of this drinkware.


Some plastics can’t hold up to the heat of the dishwasher. Unless it is specifically labeled dishwasher safe, your plastic may melt out of proportion or altogether.

Hand Painted Dishware

Hand-painted items, crystal, and fine-stemmed wine glasses are typically not durable enough to withstand the water pressure and heat of your dishwasher.

Cheese Graters and Garlic Presses

Tiny bits of food will get caught in the holes of your cheese grater and garlic press and your dishwasher will not get them thoroughly clean.

Bottles and Jars With Labels

If you decide to keep any jars or bottles, make sure to remove labels before you run them through the dishwasher. These labels can come off during a cycle and get caught in the filter of your dishwasher.

Although your dishwasher is a handy and convenient appliance, it can also destroy some of your important dishware and kitchen utensils. Play it safe and hand wash these items to avoid ruining them.

When you encounter dishwasher problems, make sure to call your professional Brantford appliance repair experts at Top Choice Appliance Repair. Our expert technicians can get all your household appliances working like new again.