Yes, Lysol. You can use the generic and you can mix the concentrate, too. I spray the plants.. lightly. It is very effect on powdery mildew. It is also used for moldy soil.

"African violets are particularly susceptible to the disease, which can be fatal for them. African violet specialists with the African Violet Society of America suggest using Lysol on the plants to cure them of powdery mildew"