Can you feel these contaminants with your fingers, or have you done a Baggie test?? If you're going solely by what the microfiber towel is doing it would be a good idea to verify there are contaminants before ordering products you might not need. The staining could be another type of issue. Can you possibly get a picture of the stains.
As I mentioned I have dry clean glass grab microfiber towels regularly when the glass is clean and if using a longer nap towel it will pull fibers out. As far as the noise you're hearing when the towel goes across the glass I can't say if I get that or not. I'm literally half deaf.
It just takes a second to do a Baggie test and it may save you some money.
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