NipSoap and water used to work in the fordland area but now we are having to deal with a genetically modified spider mind that resist pretty much all toxins and builds up an immunity to whatever insecticide you are using.
Honestly enough we have discovered that you pretty much need to use diatomaceous earth in a food grade powdered form and then blow that dust through a blower and powder every inch of the plant and top of the soil.
Food-grade diatomaceous earth is an excellent chelated full spectrum micronutrient supplement.
It is like broken glass for spider mites however it is completely harmless to humans and also food additive.
In 2006 it was easy to get rid of them.
Then over night 90% of the gardens were infested with a mite that was huge and as well bred exponentially faster... A friend is using temperatures and humidity to stay bug free.
I also use spray washed to knock down the population s.
As a grower you are judged in your ability to overcome problems. And spider mites are the most common problem.
RE: how to get rid of spider mites without pesticides or oils