Don, I don't know of any chemicals that will remove cured Silicon caulk (some others here may know). Although tenacious it can usually be peeled off by hand. If you have to scrape the caulk, I would suggest a plastic style scraper to avoid scratching the fiberglass. Plastic scrapers can usually be found at the BORG or similar stores, auto stores (body work sections), or, cringe, Harbor Freight.
Hi, sorry I missed you. I have gone to find myself, but if I return before I get back, please ask me to wait.
Nothing ever gets built on schedule or within budget.
Tool Storage Bait and Tackle, LLC.