I have used Ronsonol lighter fluid or Lysol disinfectant spray to get the glue off the jewel case. Lysol will also remove majic marker ink from almost any plastic or vinyl surface.
Another issue with used cds is the number of fine scratches on the jewel case. I have discovered that using a clear coat clearner/car wax on the case really cleans them up pretty good. The wax will also remove any small residue of glue that is left on the case.
Another issue with used cds is the number of fine scratches on the jewel case. I have discovered that using a clear coat clearner/car wax on the case really cleans them up pretty good. The wax will also remove any small residue of glue that is left on the case.