no idea, I was wondering this as well since I somewhat screwed mine up.
My best guess is to use a covered exacto knife and kinda go around it. Make sure its covered with something soft as to not damage the paint or CF.
Heating with a blow dryer would probably help as well.
Remove any excess with goo-gone
2009 128i Coupe Crimson Red
MODS: -Injen Intake-Magnaflow Exhaust-Carbon Fiber Spoiler - Carbon Fiber Grilles - OZ Ultraleggeras - CF Mirrors