Those natural oils in wood? The ones that keep it smooth and strong? Dishwasher detergent strips them away. What you’re left with is dry, brittle wood that eventually cracks.
And soaking makes it worse—warping, swelling, the whole mess.
Quick hand wash. Dry immediately. That’s the move.
Kitchen knives
Putting knives in the dishwasher is like tossing your phone into a washing machine and hoping for the best.
Three problems, all at once:
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.
