WD-40 is very good at removing silicone sealant but just make sure to completely remove it from the surface before applying any new silicone sealant as they can react.

Can you use WD-40 to remove caulk?

Removing caulk can be a time-consuming job. To make the task easier, spray any peeling caulk down with WD-40 and let it sit for 10 to 20 minutes. This will help loosen the caulk before you use a 3-in-1 removing tool.

What will dissolve caulking?

Vinegar and isopropyl alcohol will also do this. The best way to remove silicone caulk short of using a digestant is to treat it with a silicone sealant remover, WD-40, vinegar or alcohol, wait for it to soften and then attack it with a knife or paint scraper.