The previous owner of my car had put a sticker on the spoiler of his university. Of course I go to a different university so I'd like to get it off. Are there any good products out there that anyone can recommend? I think I've seen some stuff advertised but I'm not sure if thats what I need. There is also a lot of the sticky gunk that gets left behind when you remove take on the passengers side which I would like to get rid of also.