15 Things You Should Never Put In the Dishwasher

When it comes to cleaning your kitchen, you might be making some costly mistakes by loading all of your cookware and dinnerware into the dishwasher. Learn which items need extra care and get tips on how best to clean them without using a dishwasher.

Wooden Utensils

Wooden spoons and utensils with wooden handles can warp and crack due to the dishwasher's heat. It's best to hand wash these items with mild soap, dry them with a towel, and then let them fully air dry. Be sure not to soak them, as soaked wood absorbs too much moisture and can become damaged.

Cast Iron Pans

Seasoned cast iron pans need minimal cleaning—usually just a wipe-down after use. Dishwashing detergent is too harsh for them and can cause rust. When more thorough cleaning is required, use a stiff brush and hot water, then re-season the pan with a layer of oil on the stove.

Insulated Mugs

The dishwasher can compromise the vacuum seal on insulated mugs and water bottles, reducing their ability to keep beverages at the desired temperature. Hand washing these items helps maintain their functionality and avoids voiding warranties.

Crystal Bowls and Glassware

Crystal glass is delicate and can become etched, scratched, or cloudy from dishwasher heat and detergent. Hand wash these pieces with dish soap and warm water, then dry with an absorbent towel to prevent water spots.

Nonstick Cookware

The dishwasher can damage the nonstick coating on your pots and pans. Hand washing with a soft sponge preserves the cooking surface and frees up space in the dishwasher.

Copper Mugs, Pots, and Pans

To keep copper mugs, pots, and pans looking their best, hand wash them. The dishwasher can dull their shine and cause discoloration. If they start to tarnish, use a damp cloth with baking soda to gently polish the surface.

Gold-Plated Flatware

Gold-plated flatware is more delicate than stainless steel and can easily tarnish or lose its plating in the dishwasher. Hand washing keeps these utensils looking pristine for longer.

Graters and Zesters

Graters and zesters have small holes that can trap food, even after a dishwasher cycle. Hand washing with a stiff-bristled brush ensures thorough cleaning and prevents rust on the edges.

Pressure Cooker Lids

Pressure cooker lids should be hand washed to protect seals and valves from the damaging effects of detergent and heat. A faulty seal can compromise safety and performance, so always hand wash these lids and let them air dry completely.

Vintage China

Vintage china has delicate patterns and glazes that can be ruined by the dishwasher's heat and water pressure. Hand washing is the safest way to preserve these fragile pieces. Antique milk glass should also be hand washed to prevent brittleness and discoloration.

Knives

Dishwashers can dull and damage kitchen knives. Hand washing preserves the blades and handles, ensuring they stay sharp and functional.

Anything With Adhesive

Adhesives used in repairs or stickers can degrade in the dishwasher. Hand wash any item that's been glued or has stickers to ensure the adhesive holds up over time.

Plastic Containers

High dishwasher temperatures can warp plastic containers and cause chemical leaching. Hand washing is best, especially for transparent plastic, to prevent cloudiness and brittleness.

Silicone Baking Mats

The dishwasher can leave a soapy residue on silicone mats. Hand washing keeps them clean and residue-free. The same goes for silicone reusable bags; flip them inside out for thorough cleaning.

Rubber Seals and Gaskets

Dishwasher heat can deteriorate rubber seals, causing them to fail sooner. Hand wash items with rubber parts, like water bottle lids and garbage disposal accessories, to prolong their life.