Let's tell KhongAi how to take care of it while we're at it.
Taken straight from the American Orchid Society website: Another less-exotic and much cheaper method of control involves a pint of 409 household cleaner and a pint of rubbing alcohol mixed with water to make 1 gallon of spray. This method is especially effective as a preventative or to control light infestations. For any miticide, homemade or purchased, apply a heavy coating, especially to the underside of leaves. Reapply every three to four days for six to eight applications. This will ensure that both the adults and hatching young are eliminated.
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---------- Post added at 08:47 AM ---------- Previous post was at 08:41 AM ----------
PS If you don't have access to 409 cleaner, I'm sure someone here could give you an alternative. I can't or I would.