You replace wipers when they streak, not squeak. The problem is that the wipers are not perpendicular to the glass, meaning they aren't dragged in both direction, as they should be. They are tilted into the glass in one direction causing them to squeak or chatter, and that's also the reason new blades don't help, because it's mechanical.
Figure out which blade to go after and watch what direction it's chattering or squeaking, then grab the arm and bend-twist it in the OPPOSITE direction of the direction it makes the noise. Problem solved.
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350