Razors, tweezers, combs, hairbrushes, and other tools, instruments, utensils and appliances that come into contact with a client shall be sanitized immediately after each use and maintained in a sanitary condition at all times.

http://www.dos.state.pa.us/bpoa/cwp/view.asp?a=1104&q=432554

http://www.pacode.com/secure/data/049/chapter7/s7.92.html