NO SANDPAPER
NO SANDPAPER- it will make it worse, long term, by creating inconsistancies in the enamal that will trap bacteria and other junk.
first, try bleach- fill the tub and dump a gallon of bleach in, let it sit an hour and then empty and scrub it with a stiff brush. you may want to use 'mildex', a spray on anti mildew cleaner that seems to work well.
I have also had good results with scrubbing bubbles.
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