You can also blast most of them off first, with the hose, then you have way fewer to try and kill( super risky if in flower though). Jorge Cervantes has a youtube with these old boys that get all there plants for free, from other growers, because they have mites. They mostly just keep washing them off( and drinkin beer).
A good breeze pretty much screws there reproduction process, as well. Check Nebulas tutorial on spyder mites as well.
No mercy, No Quarter, keep hitting them hard and often, with different things, so they don't become pesticide resistant. Most things you spray can not be used during flowering.
I've heard the alcohol spray works really well.