try this out and here is a article on spider mites

It has been suggested that spraying plants with a 1:1 mixture of alcohol and water will kill spider mites on contact. Rubbing alcohol, like any alcohol for any creature, is poisonous in high dosages, and it evaporates quickly doing little damage to the plant itâ??s been sprayed on. Some people suggest a 1:3 mixture of rubbing alcohol to water, but the strong the mixture, the more certain you are to get as many mites as possible. Make sure to cover the entire plant, focusing on the bottoms of the leaves where spider mites tend to hang


How to Get Rid of Spider Mites