Keep It Simple
Perhaps one of the most effective solutions to quickly remove water stains from fiberglass is simply using liquid dish soap and vinegar. The key to this cleaning method is to heat the vinegar in the microwave, and combine it in a spray bottle in a ratio of two cups of vinegar and a tablespoon of dish soap. Shake the spray bottle gently to combine, and then spray the warm cleaning solution liberally all over the water stains.
Using a mildly abrasive scrubbing sponge or soft-bristled nylon brush, work the solution into the water stains. Rinse the fiberglass shower or bath tub clean and dry with dry towels to avoid spotting.
If you find yourself facing stubborn or excessively large water stains then you may need to up your cleaning game a little bit. By essentially applying a poultice to the stains you’ll be able to absorb the water stains into the towels that you are going to place on top of the stained areas.
Several clean towels, hand towels are the perfect size, are good to have for removing these water stains. Place the towels in the bottom of a plastic bucket, or in your sink, and soak them with white vinegar. The towels should be saturated with the vinegar, but you can wring them out a bit. Place the towels directly onto the stains and leave them to sit for up to 20 minutes. The vinegar will help to break down the components of the water stains.
Remove the towels and scrub the stains with a soft-bristled brush or scrubbing sponge. You’ll find that a toothbrush can be handy for some of those more challenging spots. Once you’ve cleaned the stains thoroughly, rinse completely with hot water.
Use clean dry towels to dry the shower or tub to avoid spotting.
Another quick and easy cleaning solution uses half a cup of table salt, half a cup of baking soda, and enough hot water to create a paste resembling toothpaste. Cover the stains with your cleaning paste and leave in place for up to 20 minutes. Scrub with your scrubbing brush or sponge, and rinse completely.
Keep your fiberglass shower and bath tub looking great and free from soap scum between deep cleanings with something as simple as shampoo and a scrubbing sponge that is mild enough for use on fiberglass. You can also use a scrubbing brush with soft nylon bristles. Simply scrub the soap scrum with the shampoo and rinse it clean.
You can also use a light coating of car wax on your fiberglass surfaces to not only bring a nice shine to them, but to help prevent stains from forming in the first place.
Another great maintenance tip to help prevent water stains, and ensure you don’t need to remove water stains from fiberglass quite as often is to spray down your shower or bath tub after each use, with a solution of equal parts vinegar and water. Rinse completely and dry with towels to avoid spotting.