A plastic scraper like as in a composite RTV remover? We use them for removing B half and B2 sealant on aircraft without scratching up the surrounding area. You can use a razor blade but go very gently and try to make sure its as flush as possible. Seen too many where some idiot just dug in the razor blade and nicked it up all over or used a paint scraper and really goobered it.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.