"Another effective spider mite treatment is to use an insecticidal oil, like neem oil, a horticultural oil or a dormant oil. You can also try using a miticide, as this will kill them." Taken from this article: https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm
Insecticides do very little against spider mites. One must use an oil or miticide...always according to package directions.