Just keep 3 window cleaners on hand. I don't think you can realistically rely on just one if you are working on other people's cars. Depending on what dirt is on the window, one may work better than another. I keep Stoner's Invisible Glass, Sprayaway Foaming glass cleaner and the Meguiar's D120 in my supply (Also have 2 bottles of the Surf City Garage glass cleaner and a gallon of the Zep's window cleaner concentrate as back-ups). If one is just moving the window grime around then one of the others should be up to it. They all have different solvents so cut through grime differently. One may work perfectly fine cleaning one car's windows and then be horrible on the next car.
Just gonna toss this out...I've not found anything that cleans the INSIDE of the windshield better than I Glass.
Bill
+1
While I do agree that D120 is more economical and carrying multiple glass cleaners would have it's merits...... I decided last year that as a hobbyist I will eventually move to IG aerosol 100%. I have very high expectations of glass cleaners and simply do not want to waste time cleaning windows with other products. I just finished my Sprayway bottle and I increased the dilution on my D120 bottles - so technically D120 still have a fighting chance.
I prefer Sprayway but use Meg's the most. When I clean my eyeglasses, I find an heavy alcohol based cleaners works better than Meg's but Meg's has alcohol (18 to 25% per MSDS but that must be the concentrate, not diluted) along with an Ethylene Glycol Monobutyl Ether.
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