Another consultant here jumping in to say you should never use soap on your stones. As others have mentioned, because it is pourous clay, the soap gets absorbed by the stone and will then be cooked back into your food.
I also wouldn't try washing it in the dishwasher without soap simply because there could be soap residue left over and if you use any of those Jet Dry type products, that could have the same effect as soap. I don't think you want to ingest that.
As for the person who broke theirs, if you still have the receipt, you should be able to exchange it. Although keep in mind that the warranty policies have changed. They used to simply accept a piece of the stone back for a full replacement for the life of the stone. Now there are no more lifetime guarantees on the stones. I'm not sure of the exact warranty as I don't have the info in front of me, but if you have your receipt, there should be a number for Pampered Chef customer service that you can call and they can let you know if you'll be able to replace it.
Patty: I'll have to look into the broiling situation. I've used mine once or twice with the broiler, but only for a few minutes while trying to brown the top of something. I'll let you know what I find out.