We've found the worst bit to be the air-floor, as the material is almost like a cheese grater - any small blob of dirt, if you rub it with anything, ends up mashed into the tiny holes in the material. Scrubbing a bit with a domestic pan scrubber gets there, but shreds green bits off the scrubber.
I've since got a couple of large non-slip doormats to put down on the airfloor to keep the dirt off. I considered a nice sheepskin rug, but couldn't get one the right size.
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