that's when I start making a game of clean up. I dis-assemble the play mats and make them into islands, then I swiffer vac around them and pretend I'm the shark. They had better jump to the next islands as i take each one away to clean that spot. Eventually there are no islands and they are on the couch so I can vinegar spray and mop and dry. I say things like "now you are walking through the jungle" and motion swimming arms and they do the swimming arms, "look out!" etc. They are excited, happy, squealing when the parents come and the house is clean so I can get on with my night and not have a mess to deal with when my day should be done.