I'm in the process of overhauling my Campy Croce d' Aune rear derailler. It's dissassembled as far as it can be except the linkage pin is still connected to the main body (the c clip is very small and I didn't want to risk breaking or losing it). I am able to clean (with soap and a toothbrush) all the parts very well except for inside the main body where the springs are (too small to get toothbrush in there). I can see grease and crud in there and was wondering if boiling in water would work (note it is very smooth so its not a big deal, I just want it to look clean in there). I wish I had an ultrasonic cleaner but I don't. I'm guessing there are bike specific cleaners that I could spray in there too. But....will a simple boil in water work? Or will the grease just stay there. Will this harm anything(I don't think so)? thanks!