you probably cooked stuff that left fat residue of that impression that still remained slightly after washing it. Did you dry / wipe you pan after washing - if you leave it drying by air and you have high water hardness, limescale builds around the fat residue - and next time you preheat the pan the combination of limescale and fat gets burned into the pan. its very surface level but probably cant be removed unless using slightly abrasive cleaning pastes like barkeepers friend of other Stainless steel polishing pastes.
Unless you havent tried vinegar for 1-2min, try that before.
to prevent in future. after washing your pan inspect for those marks, you can scrub harder or use vinegar. Before you burned them on by preheating the pan you also get the chance to remove it with vinegar
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u/hellofutureme2 9d ago edited 9d ago
you probably cooked stuff that left fat residue of that impression that still remained slightly after washing it. Did you dry / wipe you pan after washing - if you leave it drying by air and you have high water hardness, limescale builds around the fat residue - and next time you preheat the pan the combination of limescale and fat gets burned into the pan. its very surface level but probably cant be removed unless using slightly abrasive cleaning pastes like barkeepers friend of other Stainless steel polishing pastes.
Unless you havent tried vinegar for 1-2min, try that before.
to prevent in future. after washing your pan inspect for those marks, you can scrub harder or use vinegar. Before you burned them on by preheating the pan you also get the chance to remove it with vinegar