Dampen the rust stains with water. Spread a layer of baking soda over them. Wet a soft nylon brush with water and scrub the baking soda gently into the ruststains. The water in the brush should combine with the baking soda to form a paste; if it doesn't, wet the brush again to add more water to the mixture.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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Use "Barkeeper's Friend", found near the Comet in the cleaning isle. I swear by this product!
Make a mixture of white vinegar and baking soda,rem of tartar and lemon juice or try plain coke
Dampen the rust stains with water. Spread a layer of baking soda over them. Wet a soft nylon brush with water and scrub the baking soda gently into the ruststains. The water in the brush should combine with the baking soda to form a paste; if it doesn't, wet the brush again to add more water to the mixture.
I found this article that might help ... http://homeguides.sfgate.com/rust-stains-off-fiberglass-48360.html, good luck