dip enough 95% alcohol in a soft cloth or the like, and then gently wipe the adhesive, the adhesive will become soft and detached easily, and the alcohol will generally not damage the surface of plastic parts or car paint.

For the self-adhesive traces on the surface of hard objects, we can apply grease-free nail polish remover to the surface of the objects, and then gently wipe them with a soft cloth. We can also remove these traces with industrial alcohol or gasoline. If these stickers get on the skin, you can also use lemon juice to remove them.