Some options you can do.
1. Get a spray like Canna Cure(Good option, really fast but which a microscope you can see death mites).
2. Get yourself some Amblyseius californicus, these insects eat all the spider mites, when all mites are eaten, they leave. ( Best option, but takes times )
3. Neem Oil and use a paintbrush. ( don't like this option, take long time and death mites will stay as well)
Be fast, these mites are multiply fast!
Good luck removing them :)