This might sound weird, but it works.
#1 Nicotine.
If you have a License to buy, do it. If not this works as well.
I have had a mite issue in the past and what I did 1st off is just smearing or knocking off what I could via hands. It works for the bigger ones but 70%ish still stay and with a mother mite, she can lay up to 200 eggs in a matter of days. It started to catch up on me and then after a talk with my parental, a hort head of sorts and me being a 3rd generation greenhouse owner, we decided the best course was Miticide or a substance called Nicotine.
**Miticide in my opinion is NOT safe for your plants that are consumable. DO NOT TRY IT. Just wanted to put it out there in case you came to this conclusion.**
Just like what we smoke or chew guys, it kills, plain and simple. To buy Nicotine it requires a license and basically a FBI background check (well, it's what it feels like). We could not buy it so I did the next best thing. I bought a can of smokeless tobacco, straight, no flavorful additives. Will not drop the name of the brand but they are out there. I soaked the tobacco in 7ph water and in a few days I had the nicotine seperated from the tobacco and just drained it into a gallon of water, I'd say I put about 1oz of nicotine based water into the gallon jug then filled it up, poured it into a spray bottle, then with care, I sprayed the bottom leaves and anywhere else that needed it.
After 2 days of 1 spray I had no living mites what so ever and never seen eggs hatch into larvae. It left no taste or dis-coloring to the plant but it sure created genocide to the mite population.
Nicotine works, believe it or not.