Sorry to tell you but your house floor is still dirty. With the flesh from your body, the debris from entropy dissolving your possessions, even with outside things like tyre dust and petrol fumes and pollen and evaporated dog piss. If your shoes are wiped to where they look clean, wearing them indoors isn't going to make much difference. And you should always assume every floor is dirty when you make a 5-second rule decision. Now excuse me, I gotta go swiff my floors.
