My 2000 MacBook white unibody is showing its age. The keys still function perfectly smoothly, however there is a grime on the keyboard and keys themselves from the years of use. I'd like to clean it off, but am afraid that I might use the wrong product and ruin something. I was thinking of using a terry cloth rag with some sprites of 4-0-9 or something non-bleach. Maybe even Windex? Anyone have any ideas or thoughts? Thanks!