What is the proper way to wash baking stones ?

I don't really think there is much difference between a bread stone or a pizza stone, but this site suggests scraping the stone and never washing it.

I have lots of stoneware (hazzard of going to Pampered Chef parties) and find that you have to wash it sometimes. The instructions that came with all of it state that you should not wash, but just scrape and use water. What I have found, is that if you use oil in anything you have cooked, the smell of the oil will begin to take on a rancid one and water alone will not get rid of the oil (as we all know, water & oil don't mix and the water will not break down the oil).

For the most part, I try to just scrape the stoneware, but when it is oily, I often use vinegar and let it set in the bottom or use a plastic scrub pad (no detergent) to clean it. I then use some lemon juice on it and rinse really well. If you don't get rid of the oil, it will start to smell and will make the food you cook smell that way.

Because stoneware is seasoned, and soap is used to attack and cling to grease, if you try to clean your stoneware with soap, it will end up clinging to the oil and leaving a soapy tasting residue behind. The next few items prepared in the stone will probably taste like soap. Soap will also cause a break down of the seasoning process which is essential to the baking performance of your stone. A well seasoned stone should be a "cinch" to clean. Simply run HOT water over the stone (after is has cooled to room temperature!) and scrape off stubborn pieces with a nylon scraper, or brush the surface with a clean (no soap) nylon kitchen brush.
**It is the HOT water that kills the germs and bacteria when cleaning dishes, not the soap. Antibacterial kitchen soap only kills the bacteria on your hands (it says so on the label). The soap's job is to loosen the food from the item so you can get it cleaned. A seasoned stone is easy to clean as foods wipe right off with the hot water. No need for soap. If you still aren't convinced, you can put the clean, empty stone in the oven at a 200 degree F temperature, since heat above 180 degrees F kills any bacteria.