I'm really surprised how well this works! The brown mold stains that appear on the ceiling of my shower room never go away. I colored them and they keep coming back. To be honest this scares me because I've heard that mold that doesn't go away has very bad health effects if you're trying to tear down a garden or pull out a carpet etc. I bought this after looking and was looking for what - What is a natural enzyme to basically eat mold? I sprayed on the ceiling in the shower and then threw in a towel to wipe up the drips. I went back and did it again a few hours later. I haven't used this shower in days and when I came back it was completely mold free! That's incredible! I am happy about these results! And now, after a couple of weeks, the mold still hasn't returned. I did the same thing with my old car air conditioner that smelled of mold. I had to spray several times a day. No more smell of mold. However, now that the season is getting colder and I'm using a heater, the scent of this spray is quite strong. At least it doesn't smell like mold anymore. I look forward to it finally working out of the car air conditioner and heater - it's not a bad smell, just a strong one at the moment. I would recommend to anyone with mold problems!