From what I experienced with boats, there is no quick fix for gelcoat. The problem with gelcoat is that it's somewhat porous. Contamination like that gets right into it, making it difficult to remove. If it's not too deep, you may have some success by using a buffing compound, but too much of that will make it look worse by removing all the gelcoat layer and revealing the base fiberglass. You may also try using CLR or vinegar to remove the lime stain, if that's what it is. Frequent waxing of the gelcoat before any discoloring can sometimes be a helpful preventative.
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2013 Jayco Eagle 31.5RLDS
2018 Silverado 2500 HD Duramax
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