Mold can develop on any surface exposed to prolonged periods of moisture and warmth and this includes your windowsills.

Cold air meeting your windows (which are warmer since your home is heated) condenses and runs down the window to pool on the sills. In addition, the sills tend to collect organic materials like dirt, dust, skin cells, plant pollens, etc. While you can clean and remove mold from a windowsill it’s best to prevent it from growing in the first place.

Here are some things you can do to prevent mold growth.

  • Keep your curtains or blinds open to allow circulating air to dry the moisture.
  • Use a dehumidifier in your home to remove excess moisture.
  • Apply a sealant to trim and windowsills to block moisture.
  • Get rid of the organic materials (dust, dirt, etc.) on the windowsills to deprive mold of its food source. Dust the sills a couple of times per week.
  • Lightly spray sills with Mold Off® to prevent mold growth, do not wipe off.

If you are unlucky enough to still develop mold, don’t panic. Mold Off® is a great mold destroyer as well as a preventer. Spray the sill and let the Mold Off® stand for 24 hours. Wipe it down and, if necessary, repeat. Mold Off® won’t strip paint or wood finish and destroys mold at the roots, not just on the surface.

Recent Posts

Testimonials

I own a yacht detailing company in Seattle, where mold and mildew thrive because of all the rain we get, and after using many other mildew removers and cleaners in the past, we finally discovered Mold Off® several years ago and that’s all we use now. Other mildew cleaners with bleach in them are too strong and can actually do damage over time, but Mold Off® is mild enough to leave on canvas or other materials without needing to rinse it off while it does its job removing the mildew and keeping it from coming back. My whole detailing crew is equipped with Mold Off® and it’s the only mold and mildew product we use anymore. I highly recommend it if you want clean canvas free of mildew!

- Natalie Sears (Deckhand Detailing)