Good advice above. Provided the finish is not oxidized a good wax or polish like NuFinish should be great. I often use a wipe on product like Chemical Guys Boat Hybrid Shine periodically after waxing. It’s a spray on wipe off product that also helps with sun UV. They also have a neat warterless car wash I use period to the hybrid shine if the boat is at the dock and not on trailer.
the Bar keepers friend mentioned above will take off staining but it is an abrasive and not very gel coat friendly.
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