Isitharry t1_jb2v03o wrote on March 6, 2023 at 12:34 AM

Cast iron and most raw metals that require seasoning. Stainless tends to discolor as does untreated/raw aluminum. If you do put dishwasher safe stainless, make sure it doesn’t contact anything. Anything with a coating will do okay but its life expectancy will inevitably be shortened such as that of Teflon coated pans. I hear applying a light coat of oil after drying is recommended for this. Wood is a big no no. Plastics also will lose elasticity over time with regular use in the dishwasher. You may want to download the user manual for your dishwasher as it may provide proper loading of utensils and such. Hope that helps.

SimpleVegetable5715 t1_jb345m8 wrote on March 6, 2023 at 1:48 AM

For stainless steel to conduct heat, it has an aluminum or copper plate glued to the bottom. Some BIFL brands like All-Clad and some (now harder to find) lines of Calphalon use tri-ply construction where the conductor metal is pressed between the two sheets of steel like a quarter. But aluminum and copper are not dishwasher safe, and the glue used to fuse the plates to the other pan's bottoms will eventually degrade in the dishwasher.

Not that I disagree with anything you said, you seem to know your stuff! It may say dishwasher safe, but it will definitely shorten its lifespan. To get the residue off of my Teflon pans, I've found pouring white vinegar in them and letting that soak overnight usually removes the residues and brings the nonstick quality back.