This past weekend I had some
varnish drip onto my white
awlgrip (didn''t notice it until the next day when it had dried). I was able to wet it with mineral spirits and scratch it off with my fingernail.
I assume, however, that if you are posting here that it is more serious than that. Depending upon how old and porous the gel coat is, you may try using a razor blade or prehaps some very fine sandpaper (400 or finer). It''s not much, but I hope it helps.
Doug