Make sure the area you’re treating is well-ventilated. Open windows or turn on fans to keep the air circulating.
Pour the 3% hydrogen peroxide directly into the spray bottle—no dilution needed.
Let it sit for about 10 minutes. During this time, the peroxide will penetrate the mold and start breaking it down.
After the peroxide has worked its magic, use a small brush or old toothbrush to gently scrub the area.
In most cases, the mold will lift easily with just a few strokes. For stubborn spots, a little extra pressure may be needed, but the peroxide usually does most of the work.
Use a clean cloth or paper towels to wipe away the loosened mold and any leftover peroxide.
If needed, spray a bit more peroxide and wipe again to ensure the surface is completely clean.