Im looking for something that will be a good at removing stains in my gelcoat of my V21. Im not sure how thick the gelcoat is so id prefer to not have to use a rubbing compound or FSR that will take away part of the gelcoat. The stains appear to be either dirt or organic from leaves. Ive heard simple green all purpose cleaner works well. Anyone try that or have any good ideas it would be much appeciated.