The average gas station that you frequent or stop at away from home have been in service for the last 30 to 50 years. Those gas station nozzles are the most germ carrying fixtures on the outside beyond your garbage can. In fact, gas pumps tend to be the dirtiest things a person touches – 71 percent of gas pump handles are “highly contaminated” with microbes associated with illness and disease, according to a study by the Kimberly-Clark Corporation.

Gas pump handles turned out to be the filthiest surface that Americans encounter on the way to work, according to a study released on Tuesday by Kimberly-Clark Professional, a unit of personal hygiene giant Kimberly-Clark Corp.

A team of hygienists swabbed hundreds of surfaces around six U.S. cities to see what everyday objects are breeding grounds for the worst bacteria and viruses.

The top offenders, following gas pumps, were handles on public mailboxes, escalator rails and ATM buttons.

Closely following on the filthiest list were parking meters and kiosks, crosswalk buttons and buttons on vending machines in shopping malls.

"It comes down to the fact that nobody cleans the things that you're going to touch on a daily basis," said Dr. Kelly Arehart, program leader of Kimberly-Clark's Healthy Workplace Project.