i have recently had the great fortune of acquiring an all original raleigh competition gs. after a marathon clean / degrease / re-grease, the bike is running perfect.

the only problem is that the original brooks professional saddle is turning the butt of all of my pants brown. initially i assumed it would take a little while to work all the dirt out, as it was evident when i got the bike that the previous owner had ridden it pretty hard. however, it's been a little over a month now, and while constant use has given the saddle a beautiful sheen, it's still leaving my butt very, very brown. any suggestions on how i can fix this?

thanks.