Boat cleaning question

On cleaning boat have several running stains of orange/brown color. Thought was rust, but no metal around and rust remover (CLR) does not work. Anyone have a secret to remove these or what the stains are??
 
on and off,, marine shop supply..
 
FSR or fiberglass stain remover-works very well also
 
You guys are crazy...... Anyone want to talk about the damage a magic eraser has done to thier boat. I have seen them actually remove the color out of a seat including the white.
 
It's like a real fine sand paper I have only used on gel coat and it worked well for me
 
I use 3M Restorer and Wax. If the stains are really heavy I would recommend using Spray Nine first.
 
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