Here is a free B for you all. This is what most most professional detailers use to clean glass and windows. You won't need Windex, Sparkle, Bleach, Annomia, newspapers, vinger or anything else. Take a 32oz spray bottle, buy some DeNatured Alcohol (at any paint store or hardware store) put 3-4 oz of the Denatured Alcohol in the bottle, fill reminder with distilled water. YOu now have the most effective most economical glass cleaner around. Don't forget to use Micro fiber when cleaning glass. I have found that the 2 towel method is best on glass. The first pass picks most of the debris, and the second cleans it up.