I also used isopropyl alcohol to kill my mites. I only had spider mites on my house plants. Not my orchids. You can use 70% or 90% rubbing alcohol either or. Whatever is in your house pretty much will do. It works really well. Also, as stated, the humidity must be increased to deter the mites from coming back. You may have to give multiple applications of the alcohol. As you would with the miticide. The alcohol will just evaporate into thin away with nothing left of the plant. This is also safer if you have pets or children. I would mix a 50/50 solution of alcohol/water. Make sure to get under the leaves cause these critters are clever...lol Don't go crazy with the spraying because these little guys "mite" propel to a new location.lol...haha...happy hunting :P