Fill a bucket with 1 gallon of hot water.
Add 1/2 cup of baking soda and 2 cups of white vinegar to the water. Stir the three ingredients together with a wooden spoon.
Dip a sponge in the baking soda and vinegar solution. Wring out excess moisture.
Scrub the surface of the door, starting at the top, to remove sticky residue along with dirt and dust. Rinse the sponge frequently in the second bucket, filled with warm water only. Continue to scrub the entire door surface.
Wet a clean cloth with water. Squeeze the cloth to remove excess moisture.
Wipe off the door surface to remove the baking soda solution and prevent a powdery residue. Dry the door with another cloth.