I have black tiles in my shower recess that has white stains all over , particularly on the edge of where the water settles after use. i have tried all sorts of tile cleaners inc. all of the major cleaning products and CLR with no joy.
Any suggestions
333500cookie-checkshower stain
If you’ve tried an acidic bathroom cleaner (like Spray n Wipe) then whet you have essentially is scale – calcium and magnesium sulfate. Only remedy is mechanical abrasion with a paste or cream cleaner