I've blasted them off with water in a hand sprayer. A white shower curtain hung on a wall caught the sprayed off mites. Lightly infested small plants were easy to do and it seemed to eliminate them; lay a leaf against the palm of your hand so it doesn't get push around, then blast away. Larger...
re: Flushing & Leaching & Final Bud Swell
Flushing/Leaching
I can understand how flushing/leaching would affect quality, but I don't think it is because unused "nutes" are being removed from anything in and of itself. What I believe is going on is that depriving the plant of (say) N forces...