Entry doors and thresholds are the first point of entry for incoming dirt. When cleaning the door be sure to include the entire doorway, threshold and all, as well. Give the entire door, front and back, a thorough scrubbing with a mild all-purpose cleaner or use a bucket of soapy water. Employ an old toothbrush to scrub hinges and door handles, too. If you’ve got raised-panel doors, be sure to clean each panel completely.