How do I clean a wood garage door?
First, check to be sure that there are no cracks or chips in your paint or varnish. If there is, the water can seep through and damage the wood. Wooden garage doors can be cleaned with a solution of water and simple household detergent; mix one cup of detergent in five gallons of water and wash the door with a cloth or soft brush. You should rinse with plain water after washing. Some people choose to use power washers, which blasts any trace of dirt or grime away, but caution should be used since these can damage softer woods. Your garden hose is almost always sufficient. Let the door dry for a day or two before doing anything else (such as painting).