What are some highly recommended stain removers for fiberglass tubs?

Collinite Liquid Fiberglass Cleaner and Weiman Fiberglass Cleaner are two products that provide users with the strength necessary to remove stains and grime from fiberglass tubs, and both products have high ratings on Amazon.com, as of 2015. Homeowners may also mix their own detergents for thrifty cleaning.

One common cleaning method is to fill a spray bottle with a solution of 2 cups of warm water and 1/8 cup of dishwashing liquid. Spray the tub with the mixture, and wipe the surface down with a sponge. For stains, mix 1/2 cup of baking soda with water to form a thick paste and leave that paste on the stain for an hour before removing.