Try putting a small amount of Ajax on the back of the offending belt(s) and running the car. This helps clean the belts off. If this does not work, you can purchase belt dressing from any auto parts store that might quiet them down a bit. You can also check the belts for correct tension - sometimes overtightening the belts (by just a bit!) will eliminate the problem.
Inspect your underdrive pulley. Make sure it is not cracked.
There have been reports that badly rebuilt alternator may also be the cause of the squealing belt. Try another alternator as a last resort.
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