Asperger Syndrome

Hello all. I have a seven year old son who has been diagnosed with AS. I have heard a lot about using clay baths to ease autistic symptoms, but I am hesitant to do anything without a great deal of research first. Money is also an issue since we live on a tight budget. Any suggestions for us? We really want to do whatever we can to help our son, but this is all new to us. Has anyone else used clay baths to help with autistic symptoms? What clay did you use? What were the results? We appreciate any advice. Thank you.