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How to Clean a Fiberglass Bathtub


Fiberglass bathtubs require careful cleaning to avoid scratches.

Fiberglass bathtubs are easy to maintain, but you must be careful with them because they are vulnerable to scratches. When you clean a fiberglass bathtub, take the following tips into consideration.

Never use abrasive cleaners of any type on a fiberglass surface. Scouring powders, steel wool, or other abrasive scouring pads and scrapers must be avoided.

Depending upon the cleaning needed, try these cleaning options. Make sure to apply all cleaners gently with a non-abrasive applicator such as a sponge, cloth, or brush made of nylon, polyethylene, or polyester.

• Liquid dishwashing soap or liquid laundry detergent.

• All-purpose household cleaners, such as liquid 409 or similar liquid bathroom cleaner

• Mild to moderate alkali solutions such as mixtures of baking soda with warm water, or a diluted TSP (trisodium phosphate) substitute in warm water (make sure it’s fully dissolved)

• Spic & Span® cleaning solution dissolved in a solution of 1 tablespoon per gallon

Always rinse the cleaned surface thoroughly to make sure no cleaning residue remains.

For stubborn areas, such as bathtub rings, you can make a paste out of baking soda and a little water. Wet down the tub’s surface and gently rub the paste onto it with a sponge, soft nylon brush, or cloth.

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About Don Vandervort
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Don Vandervort developed his expertise more than 30 years ago as Building Editor for both Sunset Books and Home Magazine. He has written more than 30 home improvement books and countless magazine articles. He appeared regularly on HGTV’s “The Fix,” and served as MSN’s home expert. Don founded HomeTips in 1996.

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  1. Car polish on a fiberglass tub and shower

    • Daniel, thanks for weighing in. My caveat would be to carefully test in an inconspicuous place, and use very sparingly until you’re sure that the abrasiveness of the polish doesn’t scratch the surface.


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