Got the "Cross x Check" stickers off with the help of warming from the sun, duct tape, and a lot of scraping.

They are quite old and dried, with no sticky goo left at all. They shatter and flake, rather than peel.

I've used olive oil in other situations to get rid of sticky goo, it works a treat! Not sure how it would do with the plastic of a "carbon" frame bike, maybe call the manufacturer and ask?