How to Fix Mildew Stains on Finished Wood Window Sills

Finished wood windowsills provide a location for the growth of mold, including mildew, when humidity and moisture are present. Organic surfaces, such as wood, leather and fabric, are ideal locations for mold colonies to form and thrive. Left undisturbed, a mold colony on a windowsill eventually transfers to nearby locations. You can fix mildew-stained wood windowsills by killing the mold and removing the stains with effective supplies and cleaning techniques.

Paper towels
Vacuum cleaner (optional)
1 gallon hot water
Bucket
1/2 cup washing soda
Rubber gloves
Non-metal scrub brush
Clean cloths
Disinfectant spray

Instructions

- 1
  Pat the windowsills dry with paper towels if necessary. Allow the wood surfaces to air-dry completely to help kill the mildew mold spores.
- 2
  
  A soft scrub brush removes dried spores without scratching the wood.
  
  Brush dried mildew mold spores off the windowsills if the windowsills are outdoors. Use a vacuum cleaner to remove the spores if the windowsills are inside the home. Discard the vacuum cleaner's bag right away.
- 3
  Pour 1 gallon of hot water into a bucket, and add 1/2 cup of washing soda. Put on rubber gloves to keep your skin dry and away from direct contact with remaining mildew spores.
- 4
  Dip a non-metal scrub brush into the water-washing soda solution. Use the brush to scrub each wood windowsill, removing the remaining mildew spores. Rinse the scrub brush as needed. Apply more water-washing soda solution, and continue to scrub the windowsills.
- 5
  Moisten a clean cloth with water, and use it to wipe the wood windowsills, rinsing off the water-washing soda solution.
- 6
  Dry the finished wooden surface with a different clean cloth.
- 7
  Spray the finished wood windowsills with disinfectant spray to kill mildew that may exist in grooves or crevices.

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