When washing your hands, the parts of your hands most
often overlooked are the thumbs. Specifically, the
backs and fleshy parts of your thumbs.
And at the risk of getting too personal (HA! HA!), let me pose a challenge to you: The next time you are wiping your bum-bum after a nice dukerpoop (as my daughter calls it), please take extra special care to notice your thumbs and that they basically drag along your inner ass cheek as you wipe.
So please wash those fuckers with a little extra loving care.