Yes, and because that is 100% true, all the vineyards in the world are dropping water from helicopters every year come harvest season, in order to get the bad minerals out of the grapes; lest they end up in your wine.
That is1000% totally untrue. My family traveled from Oklahoma back in the 70s to California bought an old run-down Winery (Far Niente) restored it and created an empire in Oakville California. They now own Far Niente, Nickel and Nickel, Dolce, EnRoute, Bella Union and Element 28 Wineries. They utilize biodynamic farming which is completely reliant on soil health. As for bad minerals..lol there are none. Each mineral in the soil is there because it is supposed to be and has a purpose. And each vineyard has different soil compounds even those properties side by side. It's the minerals in the unique types of soils created in each vineyard (and just about all the soil has been imported from different areas of the globe) that give each brand is flavor and aroma (unless topical fertilization is used as in some lessor non-organic vineyards). The only other factor that contributes to wine flavor and aroma is the age of the vines with mature at 8-12 years and can be as old as 50-60 years. Older plants have a distinct fruit flavor profile.
The only reason to "wash" the fruit before harvest is in heavy dust areas and that very light practice would not be by air. But by miniature tractors. dbuilt to go up the narrow rows. Watering just before and during harvest waters down the quality of the juice. And just before and at harvest is when the quality is at its peak. Matter of fact they watch the weather rather closely and harvest before the rain if any is expected during the harvest window. Even with the wildfires in that area that have been so close, (a 20 ft road at Far Niente is what saved them a few years ago as a firebreak) Winemakers have not resorted to washing fruit even though the smoke has affected flavor.
So NO THEY DO NOT FLUSH GRAPES/VINES AT VINEYARDS. In all my trips to Oakville and Napa Valley The only helicopters Ive ever seen were private transportation Though if you get up early and go outside the only thing you see flying are hot air balloons up the length of Napa Valley. Now in some climates helicopters can be used for frost control in the case of young vines. Otherwise there is no use for a helicopter at a vineyard.
Im not a cannabis flusher and its not because of the wine experience. It comes from advice of a old and well known grower here. When it comes to Cannabis I have much to learn but If my mentor and friends say dont do it, then you can bet your ass I wont be doing it.
Unfortunately I dont profit from the Winery business. I am not a partner. I do get lots of cases of wine in the mail and a recieved a nice check a few years ago. And we get to fly on the company jet occasionally to visit. Thats a experience drive to the private terminal park, go inside check-in have a drink and walk to the plane none of that TSA bullshit. Ive visited all the Vineyards and Wineries with the exception of the Element 28 winery