Really?

If it is, it sounds like it must be the trim right below the wiper then... unless the sound is "travelling".

(As an aside, my buddy and I were initially convinced it was a speedo-cable squeal... so on the 1000 mile trip back from FL, we stopped and dis-assembled the dash assembly... only to find that it's a completely electronic speedo <img src="/forums/images/graemlins/angry.gif" alt="" /> 500 miles later, we happened to was the windows and realized the sound went away.)

So, I put about an 18" piece of electrical tape on the lower trim piece, and the noise didn't go away...

Perhaps next step is tape around the entire thing, just to rule it out once and for all.