Use a utility knife or razor blade to cut along the silicone edges
Peel off loose silicone by hand
Apply a silicone remover or adhesive remover to soften residue
Wait for the remover to work according to the product instructions
Scrape off softened silicone with a plastic scraper or razor blade
Wipe away remaining residue with a clean cloth
Use rubbing alcohol or mineral spirits to remove final traces
Wash the area with soap and water
Repeat the process if needed for stubborn silicone