I am a car detail-er who likes my vehicles clean and when the new motor home I just got had silicone caulking a little sloppy over the seams I needed to find a way to trim them clean and tight, but the silicone caulking was stuck good and no way the excess silicone was coming loose without scraping plus the excess silicone was always showing the dirt on that excess silicone.
Then I saw this product McKanica 0351 Silicone Caulk Remover Gel, 8 oz Cartridge on Amazon and read reviews and most seemed to remove silicone from fiberglass very well. So I tried it and experimented with how long to leave it on to remove excess silicone but I did not want to remove all the caulking completely in most areas. Directs say put place gel material from tube over silicone bead and let it sit 2 to 3 hours and scrape off loosened silicone. I had to do one one section that I wanted to remove and redo the caulking on slide out( it was real sloppy)
Yes it worked as directed, kind of turns silicone into a waxy goo that you scrap off with plastic scraper, I found a thin old credit card worked best for me. It took off 90% of old caulk and a 2nd application took off the rest but it was a heavy area of silicone bead that needed 2nd application. After removing excess old caulk I took a terry cloth and rubbed till it was gone off fiberglass finish, then I took sponge with car soap and washed area with hose and it was all gone....... rinsed all away, no residue this stuff totally breaks down silicone it is gone and ready for new caulk. I was really amazed to be honest. It works I am sure great on bathroom tubs and showers which are also fiberglass
What I really like is how this works when you just spread it on sloppy or excess silicone only to devolve just that part of seam without the whole seam and 30 min I found removed thin layer of excess sloppy silicone off without affecting the seam which i did not apply to. I was able to cleanup sloppy excess silicone, wipe it clean off fiber glass and make the motor home look perfect leaving my fiberglass clean and shinny.
I would suggest to experiment on your unit as well and wear rubber gloves it leaves no film on fiberglass but did on fingers. Its kind of a weird solvent, but it works great. After I was done, I waxed areas I completed and am very happy with the perfect detailed look my motor home has now.
It did not effect my decals, fiberglass finish or any of the finish at all just the silicone.It just dissolved the 100% silicone caulking that I placed the gel solvent on and it doesn't have an odor either.