Take a lemon, cut it in half (use one half for each side), then squeeze the lemon all over your mat. Lemon has long been used as a cleaning product for pretty much everything. Lemons are acidic and provide antibacterial and antiseptic properties for cleaning. Added bonus: they smell pretty good!
Then take a sponge with a rough edge, cover it in soap and water (any of your favorite organic soaps are a great option), and sponge down your mat.
Lastly, using the sponge with just water, clear off all of the soap, flip your mat and repeat on the other side.
Towel your mat off (preferably with something lint free) for expedited drying.
Super-easy way to clean your yoga mat with ingredients from your home, AND it dries in no time!