Q: Squeaking noise from rear end of vehicle on 2007 Chevrolet Aveo5

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The car is a 2004 Aveo 5 (no choice above for that)that has been very well maintained. I have had all required service done at the proper intervals. It has 86,000 miles on it and I just had the front struts and rear shocks replaced. My mechanic says that he can find absolutely nothing else that needs to be done on the car. He could not identify the source of this noise. Can you help?
(1) Answer
yeah I have the same problem tell him to take the front tire off and check between the rotor and the tin guard you have a !? pebble their. I have to do this about 2 times per week during the winter.