Easy way to kill spider mites

So this has worked for me twice, once when there was a small infestation and once when there was so many mites that you could see them from a distance piling up on the main stalk. Spray them down with one cup of water, 200 ml 9f canola oil and 2 tablespoon of Castile soap, I use dr bronners. That's it just mix them all together and spray em down under the leaves over the leaves the stalks everywhere. Stops them dead in their tracks.