The best way to make sure your yoga mat has its best chance of a long life is to keep on top of cleaning and maintenance. We suggest that you keep it in a dry, well-aired space when not in use. Regular wipe-downs with warm water will keep it fresh.
If you feel like it needs a slightly deeper clean, mix 1 part vinegar to 20 parts warm water and give it a spray, then wipe it down with a warm water cloth before storing it in a dry airy area.