Picked up a 3M decal removal wheel, this thing works great! I've got all the decals and most of the residue off of the hull on my '04 SJ, but it seems like the wheel is all gummed up now with decal residue. It says to use a "cheese grater style" thing to clean the wheel up??? I tried spinning it against a file but that didn't seem to help. The wheel just isn't removing the decals or residue that great anymore. Do I just need to spin it faster? Moving on to the painted section of the ski now...