P21S windshield washer additive - I thought added to any brand of washer fluid was the same across the board....
I was wrong. I was previously using the *winter formula* Raindance Washer Fluid with P21S. The car was in for some minor service and they refilled with the OEM BMW washer fluid.
It was like a night and day difference. I doubt they wiped the wiper blade edges, but the OEM washer fluid was THAT much better.
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