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Mix a half cup of vinegar with a gallon of water. Stir to ensure that the solution is evenly mixed. Dishwashing detergents and liquid laundry detergents are gentle enough for use on fiberglass shower pans. They are also generally cheaper than specialized bathroom cleaning products. Do not use bleach based products or scouring powders to clean fiberglass. Mix half a cup of baking soda with a few tablespoons of water. Mix the water and baking soda until it develops the consistency of paste. Bathroom cleaners and all-purpose cleaners are generally gentle enough for use on fiberglass surfaces, but are sometimes reputed to be unnecessarily expensive. Magic Erasers are soft sponges with cleaning solutions inside. They only need to be wet to be used. They are gentle enough for fiberglass and very good at picking up heavy stains.
Make a vinegar solution. Use non-abrasive household cleaners. Make a baking soda mix. Use all-purpose or bathroom cleaner. Use a Magic Eraser.