You can't go past Mothers Chrome Polish, a liquid.
I've used it for over a year and nothing gets the windows cleaner faster. In fact, it's the only product I've used where people have commented on, envied even, the cleanliness of my glass.
And it's the only product I've used that is dead simple and easy to get on and off. I've gone through the years of messy newsprint, commercial window preps and all... none work as well as this.
It doesn't leave a residue if you accidently go onto rubber, and it is super-easy to apply and wipe off.
For best results, leave till it dries - about a minute or less, before wiping off.
As for using MF on windows, I find it is only good for the final wipe. I've found small bug marks and water marks don't come off that easily.
Ken Silver
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1999 Mercedes SLK, 1999 Suzuki Grand Vitara, 1993 Mercedes SL500, 1991 Daimler (Vanden Plas). Finish detailing, then start all over again...