To remove mold from a windowsill, mix a solution of water and mild detergent. Scrub the moldy areas with a sponge or brush, and rinse with clean water. For persistent mold, use a mixture of water and vinegar or a commercial mold cleaner. Dry the windowsill completely after cleaning to prevent mold from returning. Regular maintenance can help keep mold at bay.

Mold on windowsills is removed by scrubbing with a soapy solution or vinegar, rinsing, and drying thoroughly. Using commercial mold cleaners may be necessary for stubborn cases. Regular cleaning prevents mold from returning.