This may be more classified as a warning to those of us with fiberglass tubs, but here goes. Be very careful with the toilet bowl cleaners, CLR, and anything that reads that it could etch your toilet bowl, as you will remove the finish a little at a time. The vinegar and baking soda will take a little time if it is bad when you start, but it won't harm the finish. After you get most of it off, you may use Zud and when all is gone, then use marine polish.
This recommendation came from the repair person who factory fixed my tub after it was put into our new house 16 years ago. My tub is still shiny. All fiberglass tubs and older tubs aren't made the same. You may also want to go to a tub and tile shop and ask what to use to clean your type of tub and then maybe you'd get something different to share with all of us. Happy cleaning.
By gbk from south GA
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