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Depends what kind of spoiler you have and how it was installed. But OEM spoilers are drilled + 3M double side taped. So if you remove it, obviously you would be left with the sticky residue from the 3M tape. But nothing some goof-off can't remove.
Two holes for the threads bolts on the spolier, one hole for the wiring harness, and two holes for the clips. You'll have five holes in the trunk lid. Believe us.