I was reading a review of the 1986 w126 S class when it was new and they mentioned it had scented washer fluid. How does that work???

Here is a quote from what they said. You can find the article on cars.com

Ride is firm, and though you`ll feel those tar
marks a little, you won`t hear them. Headlamp
washer/wiper fluid is scented. After about two
blocks, you`ll wish it wasn`t.

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99 C43
98 S420
99 C230K
01 C240