Originally Posted by raymor

Take some fine grit sand paper and lightly wipe it across the rubber edge. That will slightly take off the oxidized "skin" of the rubber right on the edge.

I also noticed my wipers squeak if it's barely sprinkling and I have them on too high. The intermittent setting helps, so the windshield is a bit wet when the wipers run. The rainwater lubricates the surface. Set too fast when it's barely raining, the wiper is skidding across a dry windshield.