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To be fair, it was probably pish to begin with. But in 1985 a group of Austrian wine makers used Diethylne Glycol, best known as the main ingredient of anti-freeze, to pad out their yield.
https://en.m.wikipedia.org/wiki/1985_diethylene_glycol_wine_scandal
andyp
Jimmy_Fingers
There's a reference I'm missing here, anything from 1985 from Austria is likely to be pish by now