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What is this slimy black gunk that came out of my windshield washer reservoir?
38,000 miles mostly spent in a garage. I’ve had it for a year. Slimy black stuff that came out of my washer reservoir. That was a lot more than what is shown.
Biofilm, a community of microorganisms (such as bacteria, fungi) that attach to a surface and are surrounded by a self-produced, slimy layer and later dry up over time.
I think the washer fluid with ALCOHOL (Winter fluid) can be used year round to prevent this.
The Winter fluid seems harder to find in the Summer. Maybe it evaporates faster with the alcohol?
Washer Reservoir black gunk
