I would wash first with an RV/boat gel wash for Fiberglass and then polish with a boat/rv cleaner wax like Maguire’s #50 cleaner wax applied with a griot’s garage random orbital polisher and a red waxing pad. After the wax/cleaner dries remove with a microfiber towel.
Tire dressing like Maguire’s Hot Shine will fling off if not fully dry causing similar spots.
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Velosprout
2014 F150 SCrew 4x4 Max Tow Heavy Duty Payload 3.5 Ecoboost 6.5' bed Ingot Metallic Silver
2015 Rockwood Roo 21SS
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