I was 3 days ago years old when I found out that it is possible for mold/biomass to grow in windshield washer fluid...
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I accidentally poured some of that crap into my washer reservoir and ended up having to pull the whole thing and rinse it out and disinfect it:
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Fortunately, it was growing in the bottle and I only poured a little in so I'm hoping that stuff didn't "take root" in the washer reservoir/system... (after reading up a bit, that occasionally happens in the reservoir, in the engine bay...)