I've cleaned mine with Windex (ammonia) and with vinegar. Not sure I can say which is better, but I've had no problems with the PVC getting slack. I do use a microfiber cloth because I'm not sure paper towels won't scratch the film over time. The tongue marks are hard to remove, but to me they're one of those things that aren't that noticeable if you don't focus on them. I'm interested in what others have experienced. You didn't ask, but I know Bill has recommended cleaning the white floor plastic with a Mr Clean Magic Eraser.