Get an edge loose, then pull it with pliers. Use Goof-off to remove any residue.
Yes, plumbing should be able to repair damage to a fiberglass tub. However, it is recommended you hire a professional plumber to work on your bath tub.
Yes, bleach can damage a fiberglass tub by weakening and discoloring the surface. It is recommended to use non-abrasive cleaners or those specifically designed for fiberglass to avoid any potential damage.
Chlorine bleach can damage the finish of a fiberglass tub and may cause discoloration or weakening of the material over time. It is generally not recommended to use chlorine bleach on fiberglass tubs. Instead, opt for mild, non-abrasive cleaners specifically designed for fiberglass surfaces.
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Most contractors of this type call themselves "bathroom remodelers" or refinishers. Despite the connotation of totally remodeling a bathroom, they repair bathroom fixtures, too. Most bathrooms contractor will perform fiberglass tub repair. Another type of contractor who perform fiberglass tub repair is refinishing contractors.
Here's a place where you can get it repaired: http://www.fixyourtub.com/
Most of them are in the wall. The other would be a deck mount, which is mounted to the fiberglass tub deck and uses a Roman Tub Faucet.
One the end of the tub above the drain there is a plate. It may be where you close the drain off or it may just be a cover plate. It is open on the bottom edge and goes into the drain so that the tub cannot overflow.
Paint thinner or a product called "goof off" in the paint section at your hardware store.
I have tried soaft scrub, regular scouring powder, soap scum removers, etc. and nothing really gets all the soap scum off our dimpled fiberglass tub. However, my husband said he used WD-40 and it worked great.
It is always better to have a professional come in and do a repair if you are not familiar with the task. A professional is recommended because the material is fiberglass.