Very simple. I use biodegradable, fragrance free dish soap at a few drops per gallon. This is added to any of my sprays, be it neem, BT, Spinosad, etc. Mites can't get used to soap you keep using it in proper two to three day intervals along with a pesticide like take down which is pyrethrin based for a ten day period during an infestation you will knock it out. Always do it monthly to maintain a pest free garden.