Removing clear silicone caulk from exterior fiberglass

Scrap off all the old silicon or other caulk. Then use a scotch pad and gasoline. Then bon ami or barkeepers friend again with a scotch pad. Then mineral spirits and a shop rag. If the surfaces are still slick and shiny, consider a light sanding with fine grit paper. Then use dicor or a similar quality sealant. Inspect annually but no work should be needed for decades.