> I have always used alcohol and a Q tip. Pencil erasers leave residue that has oils > in them. I use alcolhol from Walgreens that is 90%. SOme outlets you can find up > to 95%. Th at is even better. I guess you'll find even 100% isopropanol (ispropyl alcohol) at your local pharmacy. At least in Germany you do, about 2EUR/liter.