The window cleaning recipe I put up there came off of an about.com post, slightly modified. We tried about 10 different homemade recipes before putting two together and coming up with that one. The basic recipe didn't have the ammonia and wasn't getting all the pollutants off the outside of the glass (Atlanta is pretty murky) - the addition of the ammonia was the trick.

Another note - if your wipers are making noise against the glass, it's usually caused by the armature angle - Joe Black clued me in on this one. Basically, if you've ever had your car through a carwash, the rollers (or even the air pressure on touchless car washes) mash the wiper arms down causing the blades to touch the windshield at a poor angle - this can cause them to shudder (my case) or make noise as they pass over the glass. The trick is to slightly bend them back to the proper angle (and stay out of car washes!).

-- John