You can also spray some WD-40 on the foam tape residue, which I asume is what's there now. Spray up the residue let it sit 2-5 minutes and wipe clean. A local detail shop told me about this to remove some sticker glue residue off my withow and it worked great. Also do this when it's warm outside.

Goodluck!

1999 Silver Frost Contour SVT 2690 of 2760 Born 08/13/1999 Sony Mobile ES CDX-C90 Deck 6 1/2 Infinity Kappa Perfect mid & tweet set, 2 12 Infinity Kappa Perfects JBL P.600.1 for Bass, P.180.2 for front stage.