Yes, if you come into the forum at
www.lugerforum.com it is on the left under General Information, but here is the exact html
http://www.lugerforum.com/gripclean.html although I have used the soap and warm water on my grips and let them dry and they get nice and clean (no oil to start with, noth too nasty).
{but as Johnny said, if in near mint, I'd leave em alone, my 1940 isn't mint, but I decided to leave the grips as I found them}
Ed