I just picked up one of my two Trek 6500s up from my LBS. My rear derailler bracket was slightly bent and my cable was plugged full of crap. The mechanic I typically deal with suggested I use White Lightning Clean Streak to clean the drive train. He said the stuff works really well for taking dirt off. He recommended this followed by ProLink on the very outside edges of the chain. He also said ProLink works well on the cables (rear is the most troublesome) and if really bad, WD40 (which he said is not a bad degreaser). So onto a new regiment....back on the bike tomorrow.