The blade dulls faster
The handle (especially wood) can split
You risk cutting yourself unloading it
Honestly, a good knife deserves better. Wash it by hand—it takes 10 seconds.
Cast iron cookware
If you’ve ever seasoned a cast iron pan, you already know this one hurts.
Dishwashers strip that carefully built layer of oil right off. Gone. Just like that.
And without it? Rust. Sticking. Regret.
Yes, even enameled cast iron isn’t totally safe here. Better to stay cautious.
The Sneaky Troublemakers
Aluminum pots and pans
Ever seen aluminum come out of the dishwasher looking dull and blotchy?
That’s not a one-time thing—it’s a chemical reaction. Over time, it leads to corrosion and pitting.
Even if it says “dishwasher safe,” it’s often a technical truth, not a practical one.
Copper cookware and mugs
Copper is beautiful. That warm glow? Hard to beat.
But dishwasher detergent doesn’t care about aesthetics. It dulls the finish almost immediately and can cause permanent damage.
That Moscow Mule mug deserves a gentle hand wash, not a chemical assault.
Pressure cooker lids
Here’s where things get a bit more serious.
Pressure cooker lids have valves and seals that control pressure. Dishwasher cycles can trap food particles inside those tiny mechanisms.
Best case? It doesn’t work properly.
Worst case? It becomes unsafe.
Not worth the risk.
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