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How to clean a fiberglass shower floor
Use a nonabrasive cleaner.
If you have a fiberglass shower or tub, it is important that you only use nonabrasive cleaners, as abrasive cleaners can scratch the surface. Try using a dish washing liquid, liquid laundry detergent, all-purpose cleaner, or a soft scrub product.
Avoid abrasive cleaners like scouring powder or ammonia. Apply cleaner with a nonabrasive applicator.