I have a fiberglass bathtub and shower combo in a rental that's likely more than a decade old. The finish is very dull and feels almost matte to the touch. There are no noticeable scratches or peeling however. I've also made the mistake of using some pretty abrasive cleaners on it, which helped get rid of some tough stains, but probably killed whatever polish was left.
Outside of refinishing the tub what are some things that I can do to bring back the polish? Would something like Gel-Gloss work?
Not only that, what are some ways to get all the hard to clean buildups off before I polish? Can I use bar keepers friend or is that too rough?