Wash the decal area with soap and water
Dry the surface completely
Warm the decal with a hair dryer or heat gun on low
Lift one edge with a plastic scraper, credit card, or fingernail
Peel the decal back slowly at a low angle
Reheat stubborn sections as needed
Remove leftover adhesive with adhesive remover, rubbing alcohol, or citrus cleaner
Wipe the area with a microfiber cloth
Wash the surface again
Apply wax or polish if needed