Like someone said...saying no because it is too dirty is just silly. You get far more contaminents from everything else you touch on a daily basis.
Money is dirty, but even people who handle it all day...and then eat snacks or meals with their hands in between ...come on, whatever was on the money is on your hands.
Wash your hands in the public bathroom? Great...the guy/gal before you didn't and touched that door you are pushing to get out.
Trying on a nice new shirt at Walmart? How about that dirty diseased whore that tried it on an hour before you and the staff just threw it back on the rack?
People worry too much.
I'll take my dollar with salt please