That is what I do with gnats or aphids (when I bother). So long as the leaf is alive, I don't worry about washing away nicotine. Many of the tiny, dead bugs will fall off after color-curing. Otherwise, I just brush them off with my fingertips when I'm about to use the finished leaf.there is a "flat" setting on my garden sprayer that is just strong enough to rinse the little bastards off but not tear the leaf
In the past, I've tried various kinds of brushes to remove dead bugs from newly primed green leaf: auto brush, dustpan brush, paintbrush, etc. Too stiff causes leaf damage. Just soft enough will work for maybe a dozen leaves, then require that the brush be seriously cleaned.
It's all part of the joy of growing one's own tobacco at home.
Bob