I used this to fight off spider mites: https://www.amazon.com/Green-Cleaner-Mite-Egg-Killer/dp/B01B55SKAK
But its not magic, you'll be fighting them every couple of days until you harvest. Then once you harvest you'll want to bleach your entire grow room.
This worked really well for me. You need to let the plants dry with the lights off however or you’ll burn the leaves. Same goes with peroxide if you choose to try that...
Green Cleaner Mite and Egg Killer 2oz https://www.amazon.com/dp/B01B55SKAK/ref=cm_sw_r_cp_api_vx.0zb4TBCA1B
There is a pm treatment plan on the bottle, even though it says mite spray in the pic on amazon
Green Cleaner CCGC1002 2oz Mite and Egg Killer https://www.amazon.com/dp/B01B55SKAK/ref=cm_sw_r_cp_api_i_JC9CDbY5G9VXV
Also good for PM