Not only do I have chickens visiting the back porch, I have two ducks. Duck poo is worse than chicken poo.
All the little feathered piggies know the Door Through Which The Treat Lady Comes is the one opening onto the back porch. If they're not on the back porch waiting for me, the moment I open the back/kitchen door, they come swarming from every corner of the yard to greet me.
I do NOT feed them or give them treats any place but in the run. They may be free ranging, but they have to come back into the run if they want the goodies - especially if they want to eat from my hands. (That's always the BEST treat: shredded mozzarella cheese.)
So I have most of the flock milling about my feet ON the back porch, down the step into the yard, across a 10 foot span into the run, and finally in the middle of the run. With a few late-comers flapping and running their way in from the hinterland.
I guess I'm not that fastidious. I have one of those "outside," all polyester area rugs on the back porch. Hoses off really easily and poultry poo does not damage it. Plus, they're reversible. I bought 'em on QVC long before I got chickens, and I'm glad I bought 'em! 12x9 ft area rugs.