Mix white vinegar and water (about half a cup of vinegar per gallon) Take a rag and soak it in the cleaner, then wipe off the fence. Spray water on your fence to clean it. White vinegar kills dozens of bacteria, making it an excellent solution for cleaning surfaces. Rinse the wood fence off with a power washer. The power washer will effectively remove any loose dirt and debris from the Fence Cleaning Rome Ga. Spray the fence from the top to the bottom and work your way around the fence. Keep the tip at least 18 inches away from the wood. Pour 2 gallons of warm water in a 5-gallon bucket.