Donna Carlton suggests for facing GI tissue blocks:
>>Try hibaclens half and half with water for 10 min.<<

Hibiclens hand wash combines a mild detergent ("nonionic surfactant") with 
chlorhexidine (Hibitane), a "quat" disinfectant. I think using Hibiclens in 
microtomy is safe and reasonable, but it's not an entirely rational use of 
the product.

Chlorhexidine hand wash - the usual brand name is Hibiclens, but there are 
others, since chlorhexidine has been around since 1946 - is the best 
documented of germicidal hand washes that aren't too hard on your hands. For 
reasons I don't understand, Good Management prohibits its use, and an 
occasional hissy fit is necessary to keep the stuff on hand for when you 
really feel (and look) dirty after doing an autopsy.

MSDS at
http://www.caretechlabs.com/MSDS/HIBICLENS_MSDS.htm

Bob Richmond
Samurai Pathologist
Knoxville TN