| how long have the graphics been on the car? if they have been on a long time you may find it very difficult to remove all traces as the exposed paint i.e. not covered by the graphic will naturally weather whereas the paint under the graphic will be protected by the vinyl and so you may always see where the graphics have been, see any van purchased from royal mail for evidence of this, you can always see where the stickers have been, for the remaining adhesive you need a spotting solvent and a bit of elbow grease. | 
