To add another possible solution for people I had a creak/tick on my bike that was driving me absolutly crazy. Sounded like it was coming from my pedals or BB. So we took them apart greased everything, no dice still had the sound. After a few go rounds the mechanic at the LBS leans on my seat as a way to steady himself as he stands up and "tick".... We looked at each other in disbelief, took the seat off and put a tiny bit of lithium grease on the contact points between the clamp and the seat rails and silence from then on.