Things You Should Never Put in a Dishwasher

It’s tempting to load everything into your dishwasher — especially after a big dinner or long day. But while your dishwasher is a real time-saver, not all items are meant to take the heat (literally). Putting the wrong things inside can ruin your favorite kitchenware and even lead to breakdowns. If you’re noticing performance issues, strange noises, or poor cleaning results, it may be time to schedule a Dishwasher Repair.

Let’s look at 10 common household items that should always be hand-washed — and why:

First, wooden spoons, cutting boards, and salad bowls. Hot water and steam can warp, crack, or strip their protective finish. Over time, these items absorb water and may harbor bacteria in hidden crevices.

Second, cast iron pans. These kitchen staples require a specific seasoning layer to function properly. One trip through the dishwasher can ruin years of careful maintenance, causing rust and rough textures.

Third, nonstick pans. Even if labeled “dishwasher-safe,” repeated exposure to high temperatures can damage the coating, reducing its effectiveness and potentially releasing harmful particles into your food.

Crystal, hand-painted dishes, and antique china come next. These delicate pieces may not survive a single cycle — the high-pressure spray can cause chips or clouding, while abrasive detergents fade designs.

Sharp knives, though durable, become dull much faster in dishwashers. And their blades can scratch the machine’s interior or pose a hazard when unloading.

Surprisingly, insulated travel mugs often end up in the mix. But water can seep into the vacuum seal, damaging their insulation permanently.

Then there are metallics like copper, brass, and aluminum. These react poorly to detergents and may discolor or corrode — especially with repeated washes.

Plastic containers with stickers or labels may seem harmless, but as labels come loose, the glue can clog filters, stick to dishes, or leave a sticky residue that’s tough to remove.

Finally, we’ve seen people put in electronic accessories, baby bottle parts with batteries, or kitchen tools with wooden handles — all of which are best kept far from steamy environments.

By avoiding these common mistakes, you can extend your dishwasher’s life and preserve your favorite kitchen items. And if your machine has already suffered from a few of these blunders, don’t worry — our skilled technicians are here to help restore it.