i had them too! i only had a few of them and they rip them up off the floor and my dogs would pee on them. I couldnt handle it. we are changing the playroom into the basement and im going to be putting them back on the floor wall to wall with kids carpets in the main areas of play. im hoping it goes a a little better. to clean them i would clean them by bleach and water( the ones the dog peed on) and regular everyday cleaning i use vinger/water or green works.