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. All you need for cleaning up the WD-40 is a clean dry cloth and mineral spirit.

What will dissolve silicone?

Among the easiest and most affordable are vinegar, alcohol, and WD-40. If you need something stronger, you can use industrial-grade isopropyl alcohol, and we recommend contacting a professional. Once you have the silicone solvent option of your choice, apply the softening agent thoroughly to all areas of the silicone.

Is there a solvent to remove silicone?

Softening Solvents

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.