<human>: How do I get rid of the black mold that's growing on my walls?
<bot>: You can try using a mixture of one part bleach and four parts water to spray onto the affected areas. Let it sit for 10 minutes, then rinse with clean water. Repeat this process until you see an improvement in your wall's appearance. If the problem persists, you may need to hire a professional to remove the mold from your walls.