Neem oil is very safe, and is effective on spider mites.

Ultimately, determining the source is important; in the
greenhouse, there are usually mites present- but they are kept in check by
predators. It's when we put things out of whack with a spray program that
perpetuates itself that it becomes a wave-like problem.

Ultimately, low humidity fosters the growth of mites by making it
hard for the predators to survive. Mites can do quite well in high
humidity- even in areas with condensed moisture!- but if the predators are
present, the mites will be decimated.

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-AJHicks
Chandler, AZ