How to Clean a Fiberglass Tub. If you own a fiberglass tub, it should be cleaned differently than the traditional porcelain brands. Certain abrasive bathroom cleaners can cause damage to the surface of the fiberglass tub. There are several methods and cleaning solutions you can use to safely clean your tub.
Pick out a soft sponge or cloth to use on the tub. Never use an abrasive cleaning tool, such as scouring pads or a scraper.
Fill a basin with warm water and prepare a cleaning solution to use. You can mix baking soda and water together to clean the tub. Another option is to use Oxy Clean diluted with water. White vinegar warmed and put into a spray bottle is another effective method.
Take your time and make sure you go over every part of the tub with your cleaning solution. Scrub the surface until you begin to see the residue lift up.
Rinse the surface, making sure that no type of cleaning residue remains. If there are any additional spots, you can use a spray-on cleaner to remove them.
Clean extremely difficult areas of the tub with a baking soda paste. To make the paste, add a small amount of water to a generous amount of baking soda. Use a sponge to rub the paste onto the difficult spot. Rinse and repeat as needed.