~One man’s opinion / observations ~
Acid rain, an acidic solution that attacks the surface, made easier by the suns heat making the surface soft, the effects of which are, surface pitting and etching, the misnamed ‘water spots’ which are in fact, discolored circular acid burns.
You might have to use something more abrasive, I don’t know how thick the bra is but like paint it’s possible to ‘burn’ through it.
~Hope this helps~
Experience unshared; is knowledge wasted…/ Jon
justadumbarchitect *so I question everything*