Well, I ran 3 caps through the wash today.  They seem to have come out well, but I did learn by one of them, that I should have unhooked the 
    adjustrable strap in the rear of the cap,,,DUH ..
  The more stained part on one, I treated with Rustoleum "tough task remover", another with another of my favorites..Dawn dish soap.
  Both came out pretty good...except the one treated with Rustoleum was the one with a broken adjustment starp..so I'll have to pitch it !
  Putting on a "head shape" to dry..    Thanks guys.,,..