Just to clarify, the WD40 I referred to isn't the usual lubricant version but a special version for cleaning electrical contacts. Yep, propanol = rubbing alcohol. It does kill germs. I used it a lot for cleaning and sterilising harmonica parts from harps obtained from other people. The contact cleaner isn't pure propanol. It's got other stuff in it that might not be so desirable for killing germs on surfaces or skin.