I don't think 3M adhesive remover will touch silicone. Nor does acetone, MEK, toluene, or lacquer thinner. You can scrape most of it off with a razor blade or other scraper. There are a few commercial products that claim to remove silicone, I've not found one that works well or quickly (including DSR-5). Permatex now has one out that I haven't tried. All of them work best if most of the silicone is scraped off first, and what is left is lightly abraided with a (soft) wire brush. This provides plenty of edges for the remover to work on and under.
If you can arrange to soak it in gasoline, it causes the silicone to swell and eventually come loose. I've not tried coleman fuel but maybe that would be quicker.
The gel coat used on a Bigfoot is similar to that used on boats. It is very solvent resistant and none of the above mentioned chemicals will cause it any harm. Some of them will cause harm to the decals and any plastic trim that they touch, so you want to be careful there.
There are very few uses for silicone on an RV. Many other sealants perform better and cause fewer problems.
If you try the Permatex and it works, please report back.
Bigfoot 10.4E, 2015 F350 6.7L DRW 2WD, Autoflex Ultra Air Ride rear suspension, Hellwig Bigwig sway bars front and rear
