[Stuart]

I can't imagine a guitar being so dirty that you'd have to use soap. I don't think I'd ever put soap on a guitar.

I keep my guitars clean, by wiping them down with a soft cloth after each time I play. That's basically all I do. Once in a blue moon, if the top gets really smudged with fingerprints (but it doesn't, why? because I wipe it with a soft cloth after every time I play) I might use some guitar polish (which is basicly oil and water), but on glossy surfaces only.