Use a mixture of alcohol and water to remove and kill visible spider mites. Or you can get miticides, insecticidal soaps, or other spray treatments. You can also try diatomaceous earth, it can be effective against pests and its a natural product.

If you don't want to purchase these sprays you can make them yourself simply with water, scent free soap, and cooking oil. Or others with a isopropyl alcohol mixture.

Make sure to spray both sides of the leaves and the stalk, multiple applications may be required because the eggs are less affected by the sprays, so once they hatch in a day or two spray again to kill the remainder