Has anyone tried one of those "at home do it yourself dent romoval kits"? I have one ding on the drivers door, and it seems like it's all I see when I look at MO, it sticks right out at me. If so, do they really work, will they leave any kind of residue on the paint, or will they scratch the paint? I would think 20 bucks sure beats a trip to the body shop, but not if I'm gonna do even more damage! Please let me know!