One of our favorite customers asks us, upon the occasion of her pressurewash, "what's to stop all that mold from coming back in this wet weather?"  We may claim to be Newton's best house painters, after all, but we can't stop the rain from falling.

Great question!  Here's your answer, Annette: the mildew spores take at least a full season to adhere and all exterior paints contain mildewcide...so the spores require an airborne food source to stick to the house--pollen, dirt, dust.  A well-washed substrate (surface) will not offer the spores sanctuary for a few months.