Cleaning car the windshield is exposed to the fungus

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Some weeks I get a bit of a problem on the car windscreen. Previously unaware if the glass front of the car exposed to the fungus. Since I rarely use at night. But last night, I just realized when the rain fell, the view of the glass is very opaque and slightly unclear. I asked a few friends, and it should be immediately brought to the salon cars to be cleaned. But I am anxious to clear their own, without having to commute to a salon car if one day it happened again. Do you have any thoughts on this? Is there a practical and fast way to remove mold on the windshield without having brought to the salon a car? Solution and your feedback is very useful and valuable for me, and perhaps also for friends who have the same experience with me.