Meilleur que le savon ou alcool? L'eau!

http://www.asm.org/Media/index.asp?bid=42835

They found that washing the fingers with plain water gave the greatest level of norovirus reduction, with an average of about 96% removal. Washing the fingers with an antibacterial liquid soap gave an average of about 88% removal. The alcohol-based sanitizer was not effective at removing the virus from the volunteers’ fingers and only resulted in an average removal of 46%.