How do you clean a fake grass mat?

I live in a 2nd story apartment and purchased a fake grass mat/carpet to place outside on the deck for my dog to use as a toilet if I m unable to walk her as she s still getting housebroken and going for a walk at 2am when she wakes us up isn t ideal. What is the best way to wash it without using harsh chemicals... show more I live in a 2nd story apartment and purchased a fake grass mat/carpet to place outside on the deck for my dog to use as a toilet if I m unable to walk her as she s still getting housebroken and going for a walk at 2am when she wakes us up isn t ideal. What is the best way to wash it without using harsh chemicals that will hurt my dog or the environment? The rain does a decent job of an occasional rinse but if it goes a couple days the urine smell gets a little strong.
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