If the squeal went away when you put the crap on the belt.
I suggest that you remove the belt, clean the pullies with a mild solvent such as alcohol, then install a new belt, properly adjusted. Keep the old belt as an emergency spare.
Crap? Yes, WD40 was designed to repel water when moisture could cause issues with old ignition systems and other electrical systems. The original stuff was not a lubricant although its modern version has lubricant. If you want to see if your WD40 has lubricant in it, spray some on a window and check it for residue after it dries.
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