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Why Aren't Pots & Pans Dishwasher Safe?

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This is just me being curious … why are various pots and pots not dishwasher safe? I’ve heard reasons given about Teflon coatings, special treatments, blah blah blah.

  • If a pot can handle boiling water at 220 degrees, why can’t it handle regular 140-160 hot water?
  • If the coatings can handle various food items and sauces stuck to it at high temperatures being mixed via physical contact of a spoon or spatula, why can’t it handle jets of water hitting it?
  • If cleaning solutions and a sponge or pad can be used to physically clean off residual particles in a sink, why can’t it handle the cleaning chemicals in a dishwasher?

Just one of those things that makes me go hmmmmmm ….

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The main ingredient in many dishwasher detergents is an alkaline salt, like sodium carbonate. Many also contain phosphates. They’re pretty corrosive, so aluminum pans can be discolored by them and some of the pan coatings can be dissolved.

Silver and pewter have low enough melting points that dishwashers can cause those items to lose their shape, and cast iron tends to rust when it’s air dried.

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