One item you may have on hand that helps soften silicone is ​mineral spirits​, which is suitable to get silicone off of hard surfaces like tile, marble or concrete. For removing it from plastic or painted surfaces, however, you should use ​isopropyl alcohol​, which won't harm the surface.

How do you remove dried Silastic?

Cut away the worst of the sealant using a sharp blade. Ensure the surfaces are completely dry. Apply Selleys Silicone Remover on the surface of the old silicone layering it about 3mm high (ensure you apply to a small area to test first). Allow 2-4 hours for thin beads of sealant to soften.

What chemical will dissolve silicone?

Apply acetone, white vinegar, isopropyl rubbing alcohol, toluene, or xylene to the silicone caulking. Spray or rub one of the solvents on the silicone caulking to dissolve it and scrape the area with a putty knife or scraper. Pour water on the area, wipe up the area with a rag, and vacuum it when it's dry.