Just a little bit of info for anyone whoever gets spider mites, share the knowledge.
Soap & Water - Mix a dilute solution of non anti-bacterial dish soap and water, and spray (fine mist) the leaves of your plant, particularly the underside where the mites like to live. May require multiple applications depending on how well you can cover each individual leaf of the plant. Make sure to rinse off the leaves with plain water 20 minutes after spraying in order to prevent the soap from clogging up the stomata on the leaves, which will stunt plant growth if not cared for.
Soap & Water Plus Version 1 - Gather 1/4 cup baking soda, 1/2 cup apple cider vinegar, 1 tablespoon lemon juice, 2 drops dish detergent & 1/4 teaspoon epsom salt. Take one cup of hot water to dissolve epsom salts and pour into a clean 2 liter container with the rest of the ingredients. Add water to fill to 48 ounces (a 2 liter bottle will be 3/4 full) and shake well. Put into a spray bottle and cover your soil/medium with plastic. With the lights off, mist the plant all over concentrating on the underside of leaves. Wait 20 minutes and sprits off with clean fresh water, shaking as much water off the plant as you can. Solution is alkaline and rinsing is important in order to remove mites and eggs, and to prevent the solution from burning the plant leaves. Test on a small portion of the plant and wait 24 hours to observe before dousing the whole thing. If you see plant damage, dilute with more plain water and test again.
Soap & Water Plus Version 2 - Gather 1/2 cup baking soda, 1 cup vinegar, 3 tablespoons lemon juice, 2 drops dish soap, mix and dilute with plain water to 40 fluid ounces. Use in the same manner as Version 1. Shown to work both indoor and out, with success on spider mites, thrips, aphids, clover mites, grass gnats and mosquitos.
Soap & Water Variations - Since all plants will have varying degrees of sensitivity to these sprays, you can try to create your own by mixing water with a small amount of dish soap, as well as garlic, cinnamon, clove oil and lemon juice.
Rubbing Alcohol - This poisonous liquid can kill mites and evaporate relatively quickly in order to reduce harm to plants. Varying degrees of success have been reported with solutions ranging from 1:3 (light) to 1:1 (strong) ratios of rubbing alcohol to water.
Predatory Mites - These mites do not feed on plants but on other mites. Predatory mites can be mail-ordered from a horticultural warehouse or purchased online from gardening vendors. Three of the most common mites used to kill and control spider mites include Phytoseiulus persimilis, Metaseiulus occidentalis, and Phytoseiulus longpipes. The Phytoseiulus persimilis variety is nice because these guys cannibalizes on themselves after eating the problem mites, thereby reducing their own population naturally after they've finished their work. Phytoseiulus longpipes can stand higher temperatures, so if your grow space is above 89°F, you should try to find this variety.
Miticides - When all else has failed, miticides will be one of the most effective forms of spider mite treatment. You should generally try not to use these more than necessary, as they are considerably more toxic than all of the above treatments, and can also cause resistant strains of mites if used repeatedly over time on the same population of mites.
Pyrethrins are natural organic compounds that provide potent insecticidal activity. While pyrethrins are slightly toxic, they are not very dangerous to humans and have been used as an organic crop dusting agent in agricultural farmling as well as indoor agriculture for some time. You can also find them in some shampoos designed to remove lice/ticks from humans and pets. Riptide 5.0% Pyrethrin is a common solution that works well.