For obvious reasons, it’s really important to keep your yoga mat clean. Different mats have different washing instructions. Some you can throw right in the wash, and some you need to wash thoroughly by hand in a large sink or tub. Either way, if you do yoga frequently, you’re going to need to wash your mat frequently.
There’s no way I can feasibly wash my mat in the washer or tub every time I use it. It’s just not practical. But I am extremely fussy about keeping my mat clean and fresh. So, what I use is a yoga mat spray wash.