Tiny dirt particles (and big ones too!) are tracked in every time a person or pet comes or goes. Cleaner shoes mean less dust, so it’s important to lay a heavy-duty doormat at every entrance, and to wash each one regularly. Better yet, keep a basket or rack near the door, and ask family and friends to kick off their shoes and get comfortable as soon as they walk in. This should help contain the tracked-in dirt to a smaller area.