For those who still believe they can remove the digitizer and reuse the tape, I'd advise against it. When the unit is heated and the digitizer (GENTLY!!!) pried from the frame, the tape tends to bunch up and create high spots. This, of course, won't allow the new digitizer to sit flush with the frame, thus making a poor finished product. Remove the old tape with a LITTLE heat and a PLASTIC spudger or sturdy fingernail, then use some high-percentage alcohol and a lint-free cloth to clean the remaining bits.
FYI, I didn't have the patience to separate the LCD and Digitizer and just replaced it as a unit for ~$100.