Quote Originally Posted by kiwi girl
Maybe this is my problem. My rear derailer is 105 and my bike has developed an annoying squeak. I cleaned and lubed the chain a couple of times to no avail - at one stage I thought I had traced the squeak to the jockey wheel, but when lubing that didn't help I started to wonder.

Is there anything particular you do to clean them in this situation?
Mine were sounding like a little flock of birds chirping every time I shifted. Lubing helps for a little while - you have to take the jockey wheels completely off to clean and lube the bearing inside. We use something pretty heavy to lube them - Dumonde Tech Liquid Grease (my husband calls it smurf snot because its blue ), but I eventually had to replace mine completely when winter was over. They had worn to the point that the hole was no longer round- it was oval! They aren't terribly expensive - about $15 US for a set of 2.