I've been using Rain-X Bug Remover for several years now. This leads to a good formation of water droplets during a downpour and dissolves a significant percentage of insect residues on the windshield well. My only complaint is that I noticed hard or jelly-like lumps in the liquid when I poured it into the tank, which is good news. At least my washing machine isn't clogged yet. I've started straining the liquid through an old t-shirt when pouring it into the washer tanks, hoping it doesn't build up again afterwards. Not reassuring.
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