Warm the decal with a hair dryer or heat gun on low
Lift an edge with a plastic scraper, credit card, or fingernail
Peel the decal off slowly at a low angle
Reheat stubborn areas as needed while peeling
Remove leftover adhesive with rubbing alcohol, adhesive remover, or soapy water
Wipe the glass clean with a microfiber cloth
Use a razor blade only on glass, if needed, at a shallow angle
Avoid metal tools that can scratch the window