Try using CLR, but don't leave it on the gelcoat for too long as it will dull the surface. Otherwise, cut it back with 1200 grit wet & dry and buff it with compound. After cleaning and removing the rust ... use Zirlon clear top coat .. it will stop the rust and put the gloss back onto the gelcoat. It is an all green product that will last 3 to 5 yrs.
Any good quality rust remover can be used for rust removal on many surfices.
No Are you sure they are not tannin stains left there by leaves
You can remove rust stains from a toilet by applying a commercial rust remover or a mixture of vinegar and baking soda. Let it sit for a few hours, then scrub the stain with a toilet brush. For stubborn stains, you may need to repeat the process or use a pumice stone.
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A mixture of vinegar and water can help to remove hard water stains from a sink. For rust stains, using a paste made of baking soda and water or a commercial rust remover can be effective. Scrub the affected areas with a sponge or scrub brush, then rinse thoroughly with water.
Go to the chemist and buy some Rust O Ban, works wonders on everything I bought it to remove rust from clothing. I use it on everything.
Some stains that are typically difficult to remove include ink, rust, and certain types of dyes. The removal of these stains may require specialized cleaning products or professional services.
You can use a mixture of vinegar and baking soda to safely remove rust stains from sinks. Simply create a paste with these two ingredients, apply it to the rust stain, let it sit for a few hours, then scrub the area with a sponge or brush. Rinse well with water afterwards.
You can try using a mixture of lemon juice and salt or vinegar and baking soda to remove rust stains from clothing. Let the mixture sit on the stain for a few hours, then wash the clothing as usual. If the stain persists, consider using a commercial rust stain remover.
To remove rust stains from concrete lions, you can try using a mixture of white vinegar and baking soda. Scrub the affected areas with this mixture using a brush or sponge, then rinse thoroughly with water. For tougher stains, you may need to use a commercial rust stain remover specifically designed for concrete surfaces.
You can remove rust stains from concrete by using a commercial rust remover or a mixture of vinegar and baking soda. Apply the solution to the stained area, scrub with a brush, and rinse thoroughly with water. Repeat as necessary until the stain is gone.
Oxalic acid (one teaspoon) to remove rust and iron stains