NOVI bath with jets - stains I can't get out
The bath is probably plastic and around the drain area is a yellow stain made by the hard water standing there for days or even weeks when we don't use it. The jets work great, but want to sell the house and would rather not have the stains. We have tried Mr. Clean Magic Eraser, bleach, and Scrubbing Bubbles. Nothing has worked so far. I'd appreciate the help.