Avoid abrasive cleansers like scouring powders.
Alternatively, if you have a removable shower head, then you may use this to rinse your tub.
Make sure to use gentle applicators like sponges, cloths, and scrub brushes made from polyester, polyethylene, or nylon. Abrasive applicators like steel wool and scouring pads will scratch your fiberglass tub.
Drying the tub will also prep it for polishing, if you choose to polish your tub.
For extra cleaning power, add in 2–3 tablespoons (30–44 mL) of vinegar. If your paste is thin, then just add more baking soda until it forms a thick paste.
Depending on how dirty your tub is, you may need to let the paste set for a longer amount of time, like an hour or so.
Alternatively, you can use turpentine to remove tough stains. Because these solvents are highly flammable, do not use them near open flames or heat, and make sure the area is well-ventilated.
Do not focus on one area for too long. The compound may burn the fiberglass if you do. You can purchase the marine-grade compound from your local hardware or automotive store, as well as online.
Try to avoid applying wax onto the bottom of your tub. The wax will make your tub very slippery. If you do use wax on the bottom of your tub, make sure to place a bathmat in the tub afterwards to avoid slipping.
Make sure to use cold water so the wax will harden. It is recommended that you polish your fiberglass tub twice a year.
