this post was submitted on 15 May 2024
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So it looks like ya got a couple of issues here. As the peeps mentioned, acid - weather in vinegar (preferably stonger like 30%+ if available) or chemicals to take off the lime deposits is a first start. Second it looks like the top layer(s) of the enamel are damaged and or cracked which is why you are struggling with it "coming back and not completely going away". There are fixes for this, but replacement is usually recommended if this is the case.
Thanks for the info, do you know what the fixes would be, short of replacing the tub?
I'm far from a Profi in the field but I have looked into it before. There are companies that will do it either in home or take it to them, but often it is expensive. There are many home repair kits available, but the paint on / fingernail polish kinds work poorly. The sand the whole tub down and put a new layer on are better... But the cost and work typically don't justify it. If they are just top surface damages, you could try a higher polish sand job on the tub and see.