8 Things You Should Never Put in the Dishwasher (Protect Your Kitchen Investment)
Introduction
The dishwasher is one of the most convenient appliances in any modern kitchen. It saves time, reduces cleanup, and makes busy weeknights much easier. But despite its convenience, not everything in your kitchen belongs inside it.
I learned this lesson the hard way when a treasured piece of family china came out of the dishwasher permanently damaged. The delicate pattern had faded, the finish looked cloudy, and years of sentimental value were suddenly gone. It was a painful reminder that some kitchen items require extra care.
Whether you’re trying to protect expensive cookware, preserve family heirlooms, or simply avoid costly replacements, knowing what should never go in the dishwasher can save you money and frustration. This guide will help you protect your kitchen investments while maintaining a cleaner, more efficient home.
Why You’ll Love This Guide
✔ Helps protect expensive kitchen tools and cookware
✔ Prevents unnecessary damage and costly replacements
✔ Extends the lifespan of knives, pans, mugs, and glassware
✔ Provides simple hand-washing alternatives
✔ Makes kitchen maintenance easier and more effective
8 Things You Should Never Put in the Dishwasher
1. Sharp Knives (Ruins the Blade)
Why it’s bad:
The high heat and harsh detergents can dull the blade. The jostling against other items can nick and damage the edge. Over time, your once-sharp knives become dull, difficult to use, and potentially dangerous.
The damage:
Dull knives require more pressure to cut, increasing the risk of slipping and causing injury. The blade’s edge can also become pitted or corroded.
What to do instead:
Wash sharp knives by hand with warm, soapy water. Dry immediately with a soft cloth. Never leave them soaking in water.
Pro Tip:
Store knives in a wooden block or on a magnetic strip instead of loose in a drawer.
2. Cast Iron Cookware (Destroys the Seasoning)
Why it’s bad:
Cast iron requires a layer of seasoning (polymerized oil) to create a non-stick surface and prevent rust. Dishwasher detergents are designed to strip away grease and oil—exactly what you don’t want on your cast iron.
The damage:
The seasoning will be stripped away, leaving the pan vulnerable to rust and sticking. The high heat can also cause cracking or warping.
What to do instead:
Wash cast iron by hand with warm water and a stiff brush. Dry immediately and rub with a thin layer of oil to maintain the seasoning.
Pro Tip:
For stuck-on food, scrub with coarse salt and a paper towel before rinsing.
3. Fine China and Crystal (Etches and Chips)
Why it’s bad:
The high heat and harsh detergents can etch the glaze and metallic accents. The intense water pressure can also cause chipping and cracking.
The damage:
Faded patterns, cloudy film, rough texture, chips, and cracks.
What to do instead:
Wash fine china and crystal by hand with warm, soapy water and a soft cloth.
Pro Tip:
Place a soft towel in the sink while washing and never stack delicate pieces.
