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If the fiberglass wasn't waxed for a long time prior, the glass is actually quite porous and will absorb the stains quite well. Pressure wash won't hurt gelcoat but probalby won't help too much. It would be a good first step to get off what you can.
I have diesel soot stains and have not been able to get them out. I've tried a lot of stuff. Mary Kate On & Off is about the best thing I've heard of, if that doesn't work...
Soft scrub might help, it has bleach in it. You might find different stuff for different stains.
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