FAQ 3 - Email, Cleaning
My Epson 1660 glass has never seemed clean -- even when I bought it. Finally it occurred to me to search on how to clean the sucker (top and bottom, scanner disassembles easily).
Scantips is an old time favorite web site. They mentioned pure alcohol. Cheapo 70% isopropyl alcohol worked great (pharmacy grade). Patten was clean for the very first time.
Interestingly the scans really don't look all that different.