For about the past 10 years I've used the Mr. Clean Magic Eraser, which I suspect must be the same product under different branding as the Magic Eraser referenced by toma-t-amot above.
![]()
Over the years I've used all the various liquids and gels (alcohol, the LAST products, Mobile Fidelity #9, Zerodust...) This lifetime supply of Magic Eraser has proven to be the best, most consistent stylus cleaner I've used. Just pay careful attention to how to use it as explained by Doug Deacon almost 10 years ago:
http://www.high-endaudio.com/Magic.html
+1
Art
...I guess. Never am I cleaning it because I hear it's dirty, or see a wad of gunk. 
I have always looked at this process as fail safe, and so far it has proven to be just that.