Never never ever use any kind of dressing or coating on a flat serpentine belt. When you had the belt replaced, did you tell the mechanic there was a foreign substance on it? If not he would have no way of knowing he needed to scrub all the pulleys. That stuff will get transferred to the new belt and make it squeal too.
Assuming the belt is being held tight by the tensioner and none of the pulleys are turned or tipped due to a worn bearing, you can try spraying it with engine degreaser while it's running, then washing it off with water from a garden hose. If that doesn't help, replace the belt again and wash the pulleys before you install it.
Monday, May 6th, 2013 AT 1:40 PM