If it is a shower curtain, you can just wash in the machine with bleach & soap. If it's regular curtains, I guess I would try a steamer. Black mold is very bad for your breathing. Good luck!
If it's a shower curtain you want to remove mold from you can mix 1/4 cup of bleach in a quart spray bottle with water(fill the bottle full of water after you put bleach in it),spray where the mold is, you may need to do this a few times. Good luck.
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