I've been meaning to ask this for a long time! The wipers on my '98 always make that horrible scrubbing rubber sound on the way up. I have Bosch blades on my company truck, an '06 Chevy 2500HD, and they've been utterly silent. I bought a set for the Bonnie, and it still does the same thing. The arms don't seem to be bent, and when they come back down, they wipe evenly. Just wondering what the forum thinks!

I suppose the arm springs could be getting weak, but my 1997 LeSabre'* are fine (on the same exact parts and glass as your Bonneville). Maybe try a different manufacturer of blades? My current set is Rain-X open frames. This set is about two years old and still does a quiet and good job even after wiping over a bunch of brutal ice over the winter.