We have extremely hard water in Copenhagen Denmark where I live.
Every single time I cook in my PLY or bimetal copper pans, I get the blueish white mineral buildup.
At first I used the water-white vinegar solution to remove it.
Now I’ve found my life is too short to worry over this.
It’s part of stainless steel pans patina to me now.
I don’t polish my copper pans either (well maybe once a year or less).
Cooking is already darn hard work as it is.
Why make it even harder by worrying over mineral buildup in ply pans and stripped seasoning in carbon steel pans.
My solution is - forget about it, just use the pans.
(And get rid of pans that can potentially rust if soaked in hot soapy water)