I've been there, trust me!
I simply spray cool water, perhaps with a little dish soap or insect soap, up under the leaves. Twice per day at first then once per day and then just every few days. The mites cannot handle high humidity and will leave or be dead after a few days. Very briefly raising the humidity on a regular basis like this can be a good way of battling many different bugs as they tend to like it either dry or humid, but not both. Since I have done this I have had no real bug issues. By the way, once in a while add a few drops of neem oil to the spray if you have it, then you have a really solid defense, but don't use neem in late flower.

This works, every time, it's work at first but soooooo worth it.
Bulster Reviewed by Bulster on . The Mites Eat my plants.....What about NEXT RUN??? GIVE ME YOUR KNOWLEDGE.... Hey people i am really disapointed first time spider mites.... I lost all of my yeld.....All the buds was with no potency and no Smell at all....they were like grass...... I dont hate earthly creatures but now i have problem with spider mites... My previous runs was ok i dont know why now they choose to come... Maybe is that i left a little open for the air so they come outside,!!!!! I didnt make it to control them in closet....... What do you tell me for the next runs??? I will have Rating: 5