I saw on the site that they mentioned raking it sometimes, and hosing it down.  Where it was installed at dog kennels, sometimes they used an enzyme cleaner to get it cleaner.

I think this is great stuff! What a blast! If I had a little postage-stamp yard, and I was a little old lady & didn't want to deal with it & had the money for this, I'd consider it, I think. My other option would be to sow the whole thing in wildflowers or some short-type groundcover. We have the next best thing (in my view) though- our grass is all crabgrass & moss. The topsoil is mostly all gone, it's only sandy junk left, so there's no hope of getting a lush green lawn, and there's no point in bothering! The moss helps keep the "grass" short, so all we do is mow once every few weeks or so! Personally I love a moss-filled lawn. It looks green, it doesn't need mowing, it is hardy & indestructible, it grows under shady condiitions- I love it!