I am again in combat with the windshield. One thing I find maddening is a streaky, smudged windshield. My first GXP wasn't so bad. I cleaned it when I washed the car, then I used alcohol and a clean terry towel. I had also Rain-X'd it, which seemed to help.
My latest GXP...oh my head. I have come to the conclusion that the previous owner did...something. I have literally washed the car three times, back to back to back, and still had almost greasy smears on the glass. Did he put something on the wiper blades?? Got to replace them. The inside of the glass is a nightmare. I don't think he ever cleaned it, he just sort of swirled the smudges about. Trying to clean it made it worse.
I found my old Texas Instruments glass cleaning cloth today. I will see if that helps....
Driving and working on a Sly 2008 Solstice GXP 5spd 260/260, and the worst-built 2012 LS3 Camaro 1SS to escape from Oshawa.
Gone but not forgotten:
2007 Solstice GXP 5 speed 290/340
Stored and needing to part ways with a 1970 Skylark Custom convertible I have owned since 1989 and turned into a GS455 clone. 462 with 7/8 primary headers, adjustable roller rockers, TA Performance Stage 1 aluminum heads, auto, Chevy 12 bolt, 3.31:1. Sadly a project car now but a driver from '89 to '06.