It involves easy and simple steps to remove black mold from terracotta pots. All you need to do is to prepare a mixture of 3% hydrogen peroxide in a spray bottle. Now, spray the solution on the outer surface of the pot where you can locate the stubborn black mold. After spraying, leave it for a few minutes to show the desired result. In a few minutes, the solution will work like magic to remove the mold. Next, wash the outer surface with clear water to get the best result.