Clean Runoff From Vinyl Siding Window Sills

To clean runoff from vinyl siding window sills onto siding, you can use a combination of household cleaners, tools, and methods. Here are some effective steps and materials you can use:

Materials Needed

  1. Bucket
  2. Garden hose with a spray nozzle
  3. Soft-bristle brush or sponge
  4. Mild detergent (like dish soap)
  5. White vinegar
  6. Baking soda
  7. Oxygen bleach (optional, for tougher stains)
  8. Spray bottle

Cleaning Solution Recipes

  1. Mild Soap Solution:
    • Mix a few drops of mild dish soap with warm water in a bucket.
  2. Vinegar Solution:
    • Combine one part white vinegar with three parts water in a spray bottle.
  3. Baking Soda Paste:
    • Mix baking soda with a small amount of water to create a paste for scrubbing tough stains.
  4. Oxygen Bleach Solution (for stubborn stains):
    • Follow the instructions on the oxygen bleach package to mix with water.

Cleaning Process

  1. Rinse the Area:
    • Use a garden hose to rinse the vinyl siding and window sills to remove loose dirt and debris.
  2. Apply Cleaning Solution:
    • For the soap solution, dip the soft-bristle brush or sponge into the bucket and gently scrub the affected area.
    • For the vinegar solution, spray it directly onto the stains and let it sit for a few minutes before scrubbing.
    • For tough stains, apply the baking soda paste and scrub with the brush.
  3. Scrub Gently:
    • Scrub the siding and window sills gently to avoid damaging the vinyl. Use circular motions to lift dirt and grime.
  4. Rinse Thoroughly:
    • After scrubbing, rinse the area thoroughly with the garden hose to remove all cleaning residues.
  5. Repeat if Necessary:
    • For persistent stains, you may need to repeat the cleaning process or use the oxygen bleach solution for additional cleaning power.


  • Test a Small Area First: Before applying any cleaning solution to a large area, test it on a small, inconspicuous spot to ensure it doesn’t damage the vinyl.
  • Avoid Harsh Chemicals: Avoid using harsh chemicals like undiluted bleach or abrasive cleaners that can damage the vinyl surface.
  • Regular Maintenance: Regularly clean your vinyl siding and window sills to prevent buildup and staining from runoff.

By following these steps and using the appropriate cleaning solutions, you can effectively clean the runoff from vinyl siding window sills and keep your siding looking fresh and well-maintained. Contact Rhino Shield today and receive your free quote to protect your siding and windows today!