Your fingers can be smeared with poop even when using a wipe..The key thing is regular washing of your hands not just after you poop..
I wash my hands after almost everything...
You come in contact with lots of unsanitary things everytime.. door handles, keys, even the nylons used in packaging food stuffs bought in the market. You never can tell where they've been or where the hands that touched them have been..
For me,I use a great deal of water at home to wash thoroughly, dry with a towel or tissue and then WASH my hands clean with soap and water.. I use lots of tissue when out..sometimes I injure myself just trying to clean well with tissue (peppery feeling).
I just always wash my hands, after pooping or peeing, before and after eating, immediately I get home, even while at home before cooking or touching any edible stuff... It's like my ritual rite..
But the negative side is that my palms are always dry, so I have to make frequent use of hands creams which I hate.. I hate creams in generally. Hate the clammy feel