[lettie]

I have gone for toilet seat as the cleanest place. I know that it sounds unlikely but I do have reasons. Toilets in most workplaces are regularly cleaned, including my workplace.
I reckon that computer keyboards are probably the dirtiest most bug laden places. Our infection control team did an audit recently which sounds very similar to the American study. Computer keyboards came out top of the grots. This was due to the users of the keyboards never cleaning them and because secretaries etc, have little or no patient contact within the hospital, they wash their hands a lot less than nursing staff..