Dude, you have got to get in there and spray until your hand cramps, then switch hands until that one cramps and repeat until they are soaked top and bottom with a 1tsp/quart solution of neem oil. Note this is preventative and wards off bugs that might spread to your virgin babies, but neem oil will not kill mites! For the plant that is infested with mites, immediately quarantine it, and do the following dunk procedure to make sure you get all the bugs! Mix up some pyrethrin based insecticide in a five gallon bucket with water nearly to the brim. Hold the soil tight in your pot as if you were about to transplant, and then dunk the entire plant into the water upside down, such that it is completely submerged for 10 seconds. This will fuck the mites world up, and ensure you hit every square millimeter of every leaf surface! If you have had mites in your grow room for a few days without jumping on it, its likely they have already spread and you may want to invest an entire day in dunking all of your plants, and re-sanitizing your grow area...I hate to even say that shit man sorry...
Good luck, and ACT NOW, this shit is serious...I have been brought to tears as mites got to enjoy dozens of lovely chocolope ladies, and they weren't even mine!
B*real