I recently noticed black mold starting on my bathroom ceiling. I had to get rid of it! So I did a little research and found the suggestion that hydrogen peroxide would remove black mold from even porous surfaces (like the bathroom ceiling.) I mixed 1 part 3% hydrogen peroxide with 2 parts water, put it on a sponge mop and rubbed it on the ceiling. WOW! It worked! It sure beats bleach and other cleaners. No fumes! Just had to share this with you.