Hey guys. I initially rated this a five then this happened to my mat. It’s always a hit or miss on Wayfair. 
I noticed the stain and thought it was wet since it had been raining. A little less than a week has passed, and I put it in an area where it would get light and no water.l since I thought it was a water stain. Still, this stain won’t go away. I thought that by wetting it all maybe it would even out, but it hasn’t. I’ve yet to contact customer service but I will.