This is something that no one can control because we live in New York the spring months will be a breeding ground for mold, because the climate in the spring is ideal for mold growth. Water puddling, shade and moisture in the air are the 3 cycles mold needs to grow. With this can be treated and cleaned, but if not treated and cleaned the right way it can cause more damage. Never take high pressure and try to remove this yourself, it could cost you a lot of money in the long run. Give us a call and we can help with this issue.