How can I clean hard water buildup off of a fiberglass tub enclosure?
How to remove hard water buildup from a fiberglass tub enclosure.
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Make a paste with baking soda and water. It won't scratch.
Lysol Power Scum cleaner in the blue trigger spray bottle with a Magic Eraser or a scrub brush.
Wet & forget shower for a slower, no scrub solution. You can use 2x a week to accelerate the cleaning process then once a week to keep it clean.
Start with a mild treatment like vinegar in a spray bottle. Mist and scrub.
If the buildup is tougher than vinegar, look for a more hardcore solution like CLR.