Obnoxious squealing noise in car?

I have a 2001 Ford Taurus and it's making a squealing noise. I had the serpentine belt replaced and all the pulleys cleaned off and checked and it's still squealing. Any ideas on what it could be?

Tensioner. You can purchased the whole unit or replace just the pulley.
Just for kicks, squirt a little oil on the bolt that the tensioner pulley rides on to see what happens.

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