Sanitizing is largely ceremonial. Antigens can't really live on surfaces for very long. If someone with say Hep C used a razor and cut himself with it then handed it to you and YOU in turn cut yourself with it you could catch it but even rinsing with water will get rid of the virus. If it makes you feel better dip in 70% isopropyl alcohol, shake it off(CAREFULLY) and let it dry on the blade. Probably the best way is to let it sit in the sun for an hour and flip it...at least in Florida. You folk in the Great White North may not get the same effect so make it 2 hours.