It worked immediately, but it has to be wiped off and rinsed. Don't let it set. I put the bottle down and had to run into town. Some little ol lady that has been recently wandering around swiped the bottle. I've been hoping to see her again to make sure she doesn't use it on anything it isn't recommended for. It will bleach and eat through some surfaces. Wanted to make a follow up video. Now I need another bottle.
