Things You'll Need
Wood cleaner with oxalic acid
Clear wood finish
Bowl or bucket
With all of the hustle and bustle of busy life, housecleaning can sometimes get pushed out of the way of our crowded schedules. This can be especially true for areas we don't often see or pay attention to, such as window sills. Like any surface, however, these sills get dirty. Because they support windows, where moisture tends to collect, they can often be stained by water marks. Use the proper tools and techniques to remove these water marks and keep your window sills looking good as new.
Purchase a wood cleaner that includes oxalic acid from a hardware or wood store. If you are in doubt about a specific product, ask an expert at the retailer. Oxalic acid will remove stains without harming the wood.
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Rub cleaner onto the wood with a soft cloth. Follow all directions and warnings on the cleaner for proper amount to use and drying time. Be sure the cleaner is completely dry before continuing.
Acquire clear wood finish and paint onto the wood. If your window sill is located in an area that receives direct sunlight, consider using a finish that includes UV protectors to guard the wood from fading.
All Other Materials
Mix mild dish detergent and warm water in a bowl or bucket until the mixture forms suds.
Dampen a washrag or cloth with the soap and water mixture and wipe down the window sill. This alone may remove the stain.
Mix equal parts rubbing alcohol and water and dampen a rag with this mixture. Scrub at the stain until it is gone.
Close your windows in the rain and wipe up any spills or condensation immediately to prevent water stains.
Use a toothbrush or cotton swab to get into corners and creases on your window for full cleaning.