A fragment of a song, (the chorus I assume) that I heard on an old Grateful Dead has caught my interest.

Washed my hands in muddy waters I washed my hands, but they wouldn't come clean I washed my hands in muddy waters Well I must have washed my hands in the muddy stream

This certainly sounds like a traditional song to me, If anyone can fill in the rest of the lyrics and perhaps tell me a little bit about the song I would be forever, (or at least for a few days) greatfull.