Yeah, I never used to use glass cleaner much, never seemed to have a problem with dirty windows and Windex worked fine. But lately I've been having a lot of trouble. I wonder if my windows maybe have more tint or something than previous cars. Anyway it seems to smear and have streaks more easily. I bought the Advance stuff and it seemed to work great. Then several days later I noticed the streaks/smudging again. I used the Stoners last week, and so far it looks good.
As far as the clay, I've used it a few times. It doesn't seem to pull the contaminants quite as well as the Clay Magic I normally use, but the one time I used the Clay Magic it marred the crap out of my Bonneville. I'll probably get another bar since my current Clay Magic bar is about gone, and try it again. But otherwise the Sonus one is great.
2003 Black SLE-Stock
2000 Mercury Mountaineer
1968 Oldsmobile Cutlass Convertible-455 cubic inches of muscle