Yeah soap is a big no no. I had a friend of mine do that and man was it nasty after that. Everything he cooked on it was horrible. When I'm doing a frozen pizza I have this really great pan I use. For some reason it just cooks them better than the stone. What I do is cook them on that pan with the stone in the oven. Then I pull out the stone and place that on top of the stove. I then pull out the pizza and put the pizza on the now warm stone. It keeps the pizza warm when it's out of the oven.