How To Clean Window Sills Mold. I think that it is because we have some mold from the moisture on our windows. Often, sashes are affected, so start at the top and work down.
Let the window and the window sills dry with the bleach mixture still on. You really want to get into every nook and cranny with your brush. Spray the window and the window sills down again with water.
How often should you clean window sills;
Leave the liquid on the mold for about one hour to completely break down the mold components. Pull on the center of the window track or use a blade to pop the track out of place. After you’ve applied it to the sills… Once the mold has been scrubbed, use a damp microfiber cloth to wipe the surface clean.