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a backpack wont leave any spotting if the water is 000ppm. saying that my ro unit packed up and i have been cleaning with 018ppm this week and no spots or smears and i use a backpack. :biggrin:
here is a couple of my jobs which might be the same windows as yours ,start at the top I go right to left give everyone a good scrub and a good rinse then move down to next row and so on when you get to the end go back to the beginning again but this time just rinse
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