Just thought I'd mention how well this stuff works on water spots!
I was visiting some friends recently and did their annual wax job for them. I noticed that they had some fairly visible water spots on the glass that wasn't coming off with glass cleaner. (Hard water, not too faithful with QD's. Not more than a year old, though.) I started using some glass polish when my friend mentioned using the BSR I gave him last year, as it says it works on water spots.
Well, a spray and a bit of rubbing with a cloth and POOF! Clear glass! And non-abrasive!
Oh yeah, and it works on bird bombs too!