These plants are outside, so controlling humidity isn't possible. They range in size from 5 1/2 feet to 8 feet tall, so there are a lot of leaves to treat.
I'm pretty sure I'm going to do a process of cleaning them after they're harvested. It's dry enough here on the front range of southern Colorado that they won't take long to dry even after their bath. I've been reading about a process where they use three 5 gallon buckets filled with reverse osmosis water, with the first bucket having a cleaning solution in it and the other two are to rinse. With all these plants, it's going to take awhile. I've got a covered back patio to hang everything to dry. I'm looking at some hanging racks to put the bud in. My guy doesn't think it's necessary to buy racks, but I know this is going to take a lot of space, so I'll probably at least get a couple.
My son, the former grower, told me to absolutely not put anything like neem oil on it this late. My daughter, who will be the main consumer of this product, told me she's not concerned about the mites, but likes the bath idea. I was sort of surprised to hear she didn't care because she's almost as much of a clean nut as me.