I think yer belt tensioner is shot based on:
-you replaced the belt three times. So it's not a belt.
-when you spray the belt down, the squeaking stops.
That leads me to believe it's not an alternator pulley. If it was, spraying the belt down wouldn't stop the noise. So based on that, I think that your tensioner is not keeping the proper tension on the belt, and it squeaks....until you lube it down like rags in the middle of a cornfield with the all male cheerleader team.
