Each time a shower is used, it is exposed to grime from skin oils, dirt and soap. The reaction of water-borne minerals with accumulated grime creates soap scum on fiberglass shower surfaces. Soap scum is identified by cloudy residue and white stains, which plain water cannot remove. The longer soap scum remains on surfaces, the more difficult it is to remove. If left untreated, soap scum can cause permanent stains on fiberglass. Fortunately, simple solutions are effective at cleaning soap scum and restoring fiberglass showers.
Dampen a cleaning rag with warm water. Wipe the fiberglass thoroughly with the damp rag to remove loose dirt and grime.
Fill a plastic bowl with 1/2 cup of baking soda. Slowly add 1/2 cup of water to the baking soda. Mix the solution thoroughly to form a thick paste.
Spread the paste evenly over the soap scum, using a paper towel. Keep the paste on the soap scum for 10 minutes.
Fill a spray bottle with undiluted vinegar. Spray the vinegar liberally over the paste and soap scum. Allow the vinegar to soak in for a couple of minutes.
Wipe off the vinegar, paste and soap scum with the rag. Rinse the fiberglass thoroughly with water. If some scum still remains on the fiberglass, repeat the cleaning process.
Dry the fiberglass thoroughly with a terry cloth. Coat the fiberglass walls with a thin layer of clear paste wax to prevent soap scum. Apply the wax with a microfiber rag and follow the directions on the product label.