Hello. We recently purchased a 2005 Prius (option package 6) a few weeks ago and are enjoying it very much. I've learned a lot from this site (as well as other Prius sites) over the last few weeks, and since I've only seen this subject touched on, I thought I'd share the following in case anyone's interested. I've found the easiest and best way to clean fingerprints from the navigation screen is to use eyeglass cleaner (I get it at Wal-Mart Vision Center - small size is under $2 and refills are free). Just spray the cleaner onto a clean lint-free cotton cloth (do not spray directly onto the screen - it may seep in at the edges), then simply wipe gently for a few seconds; it really works well and the screen looks great (at least until you touch it again....).