Because of the wet weather, the clothes were not dry for many days, and then the clothes had black spots. What can I do to clean them?

Soak the moldy clothes in rice washing water for one night, so that the residual protein can absorb the mold. The next day, the color of the rice washing water deepened and the mildew spots were removed. For places where mildew spots are still stubborn, you can apply some 5% alcohol solution, or scrub them repeatedly with hot soapy water for several times, and then rub them as usual, and the mildew spots can be completely removed.