Use a safe but strong cleaning solution. Be sure it's one specially formulated to eliminate mold and mildew. Then apply a chemical-free mold inhibiting treatment . Doing both produces the most effective solution. Limit houseplants inside your home.
Mold grows on plants and in potting soil.
Using an allergen sealing spray on those you keep helps prevent mold spores from becoming airborne. Store old books properly. Books, especially old ones, are a major source of mold. Store them in tightly sealed containers under very low humidity. Here are some tips that can save you a lot of discomfort.