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You get that on white plastic & ali frames as is due to oxidation. That's many on windows that have not been cleaned for ages.
You will need to scrub all the frames well first until the water runoff goes clear then clean the glass & rinse well or when the glass dries will look bad as you have found out already.
Some may use a chem boost to speed up the cleaning process too.
A quick test is to wet a finger and rub it along a frame & sill. It you get what looks like a white powder on your finger then you know it's oxidised so needs special attention.
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