The best stuff out there that I have found is either "Kyser, Dr. Stringfellow" lemon oil. Not only does it clean but will also condition the wood on the fret board. I con only get the stuff at either Kenelly Keys, or Band Aid Music. Steel wool is ok as long as you don't have any inlays. if you do it will sctach and dull your inlays. And I use either a round foam pad or the Ernie ball polish cloths from Kenelly Keys. ;)