Ha, I used to live in a condo with all hardwood floors, and we only ever wore shoes in the entryway by the front door (to take them on and off). When I'd mop t

Ha, I used to live in a condo with all hardwood floors, and we only ever wore shoes in the entryway by the front door (to take them on and off). When I'd mop the rest of the condo with those disposable Swiffer mop pads, the mop pads would only get a little dingy, but when I'd mop the one specific part of the entryway where we wore shoes, the mop pads would instantly turn dark grey, almost black. No shoes in the house. Ever!!!