Windows are a prime environment for mold growth. As condensation or even rain collects on the window pane, it drips down into the tracks. This trapped moisture is the perfect place for mold to grow and thrive, especially if the moisture is warmed by the sun. Mold, which is a fungi, will grow and reproduce in the window tracks, spreading microscopic spores through the air. These spores can irritate a person's airways, according to the Centers for Disease Control and Prevention, especially if the person suffers from allergies or asthma.
Protect your hands with rubber gloves. If the space is small, wear a face mask as well when you are handling the bleach.
Fill a container with hot water and add a few squirts of liquid detergent. Scrub the tracks with a sponge dipped in the solution. Rinse the sponge and continue until the tracks are clean. Use the sponge to soak up excess water.
Add 1 cup of bleach to 1 gallon of water and fill a spray bottle with this solution. Spray the tracks thoroughly and let the bleach solution sit on the tracks for about 15 minutes to kill any remaining mold spores.
Rinse the area with clear water, using the sponge. Soak up as much water as you can with the sponge once you have rinsed the tracks. Dry the tracks with paper or cloth towels.