Thanks for the good suggestions. But I was amused by this germophobe:
Before passing through security, transfer everything metal, including
coins from your pockets, to your carry-on before it goes through the x-ray.
If you don't, you'll be asked to empty your pockets into a bowl that has
already carried the pocket contents of many other passengers, some of whom
have colds or other diseases.
.
Your coins already have germs on them from all the people who have handled them before you--unless of course you clean each one.