I could tell you my REAL secrets to my formula, but if I told you, I'd have to kill you!! -) Dawn does a great job of suspending and sequestering grease and dirt, and if you use clean cloths, will keep your windows (that don't receive handprints) surprisingly clean for quite a while. ONE tablespoon of ammonia (just enough to raise the ph a bit to keep organics from growing in the bottle, and enhance the cleansing action. Natural window cleaner free#12 drops of Dawn Free and Clear (Home Cheapo carries it for just under 2 bucks a bottle) I intended to go into larger production with that, so I can't reveal that formula, but I will still offer a formula that will keep the glass cleaner longer than most off-the-shelf products. I developed a very good glass cleaner that worked better than anything I had ever used on the market, and made it available in a trigger spray formula to my customers. Anodizing off of aluminum framed windows would come right off the underside where droplets would hang, dry, and concentrate. The little kicker about phosphates is they do such a great job keeping dirt in suspension that window cleaners could be using filthy looking water and still 'clean' the glass, but would leave this nasty residue that actually ATTRACTED dirt. You should be able to take a soft cloth on clean unetched glass and it should glide as if you were wiping a waxed car. Phosphate residue would remain on the glass surface, and in conjunction with concentration from evaporation and heat, would do a number on the glass. This is certainly true of their earlier formulas as they had phosphates in them. The problem with cleaners like 'Windex' is they have chemicals So corrosive that they actually can etch the glass. As to it's function as a cleaner, I can only believe it might act as a mild abrasive as a window cleaner. Cornstarch and water in the proper proportions will create a 'non-Newtonian' liquid it has properties of a liquid and a solid depending on how it is treated. I founded and ran my own window cleaning business for 12 years.
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