Pyrethrin Fogger. Pyrethrins are a natural compound from the Chrysanthemum. It's highly toxic to bugs like aphids, spider mites, thrips, and just about anything that crawls or flies. Determine what bugs you have, and find out their life cycle and how long eggs take to hatch from lay to birth. Spider mite eggs hatch every 3 days so if you fog every 3 days for a few weeks you should kill them all.
Soapy water spray works well to kill bugs too, but don't spray it if you are flowering it'll fuck your buds up. I hate bugs. I don't miss the spider mite battle of the 90's. I haven't had a bug infestation in 20 years. If you have bugs your not being careful. Adjust your methods and behaviour. Don't walk in from the garden with your shoes or socks or anything you wore that brushed up or came into contact with any greenery outside. See how stressed you are now.....don't fuck up. Smarten up!