I have Pella low-E glass windows, approximately 40 windows. To have them professionally cleaned is costing approximately $400. Due to the low-E glass they are difficult to clean. When I do it, if the sun shines in they look like they haven't been cleaned in ten years. Any suggestions would be welcomed. I hate to keep throwing away money on something that I could easily do if I could get good results.
I don't have Pella but a less expensive brand of low E glass windows. I have found using a microfiber cloth with only water works the best and lasts the longest of anything I have tried and much cheaper than hiring a cleaning company. I use one cloth to wash and one to dry. My windows tilt in making it easier to clean the outside as well. I got my microfiber cloths for a dollar each and they clean everything around the house. Then throw them in the washer and they are ready to be used again.
Is this low-E on a glass panel that you can take out with clips? If so, you may have damaged the low-E coating if you are using products such as Windex to clean it. Cleaners that are ammonia- or alcohol based can cause permanent damage. Pella recommends a vinegar-based solution.
If the low-E glass is not removable then you aren't actually cleaning the low-E coating. When two pieces of glass are sealed together, the low-E is on the interior side of the glass and you wouldn't be able to touch it.
Owner's manual can be found here (the first link in the "Support Section"):
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