fiberglass???
if it's FG we're talking about....you can try methyl hydrate (lock de-icer, gas line anti-freeze, un-press. alcohol stove fuel..paint thinner...all the same thing)....it's what I used to use on boat hulls to remove fender smudges, road grime from towing, etc.....did a very good job for that....alcohol evaporates so you have to add to a rag and scrub hard....and repeat...whatever is on the FG ends up on the rag...turn/flip often
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