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Dust away the cobwebs. Use a mild dish soap. Clean around the edges.
Doors often get covered in layers of dust and cobwebs quickly – especially if they are in the corner or on an outside wall. Use a duster to periodically dust off your wood doors to keep the dust and cobwebs from building up over time.  Try to dust your wood doors, especially in the grooves of the door, once every week or so to keep them looking nice. This will also help prevent larger stains from forming. This is especially important for exterior doors because it will help keep spiders and insects from congregating near the entrance to your home. For minor cleaning, you should be able to use a bit of mild dish soap mixed with hot water. Dip a nonabrasive sponge into the water and scrub the surface of your wood door.  You can also use or a small brush (like a toothbrush) to get into corners and crevices in the door. When you finish, make sure you rinse all of the soapy residue away with hot water. Open the wood door and use a clean, damp cloth to wipe off the edges all around the door frame. You may need to rinse the cloth as you go to keep it clean enough to do the job, especially if there is significant buildup of dust or dirt. You can add a bit of mild dish soap to your damp rag if the dirt seems resistant to wiping. But be sure to clean off all of the soapy residue when you finish.