I am a window cleaner and sometimes I also do the chore of window cleaning at my own home. Even when using professional t-bars, washers, and squeegees I still can get water spots. I use a good window cleaning soap, so this does not happen very often. Even when using the right tools, it is very common to see water spots around the edge of the window. The best tool to use for this problem is the micro fiber cloth. With just a quick wipe with one of these cloths, your spots will be gone.
When using water fed poles and a deionized water system, even the professionals can have bad water spotting problems. One of the down sides to this is that the professional will not find out until they are finished with the job or the client calls them back complaining.
This can happen even if you’re using a water fed pole and the deionized water seems to be working and testing good. I suggest checking the jet on your brush. Now if you’re a professional and you’re saying to yourself how do I do that; Don’t worry, be happy. I am going to tell you. If the water on your brush is shooting out too hard, it will not run down the window correctly and rinse the window properly. This is how the window gets cleaned by rinsing it. The water should be coming out like it was being almost pored out, not spayed out. If it shoots out of the brush too hard, then the jet is too small. You can solve this problem by getting a bigger jet from you supply house. I hope this will help some of you and we will see you next week.