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Sorry, but aza does not wash out. Most cannabis is grown dirty and yes, a good rinse before trim/dry does wonders. :)

they should just stick with the non-toxic pesticides like Pyrethrum

They should put more money into infrastructure, which will allow them to grow without pesticides. Cannabis absorbs things really well and pyrethrum leaves a rather ugly taste. A lot like Kali Mist genetics, which I also cannot stand the flavor of. lol :)

I only try and spray in vegetative stage. Only use a pesticide in flower if an infestation gets really bad. I recently had to use an emulsifiable botanical oil called 'Eco-Oil' to get rid of spider mites.

I either let it go or chop and start over. I use soap or alcohol based sprays in veg only. Filtered intakes and clean garden practices keep infections super low. :) I'll have to write up a post on it. :)

I'd gotten rid of most of the mites and it's a few weeks off harvest. It's also an outdoor grow so insects are inevitable, there's usually ladybugs early in the morning flying around looking for food.