Although we can’t avoid rain, and water actually hitting your home, it in no way shape or form should be settling and causing water stains.  If you see water stains inside our on the exterior of your home, there may be a bigger issue to deal with.  Aside from costly repairs of decay, you want to avoid creating a base for mold and mildew to grow, with mold being very lethal and causing various health issues.  To read more on  mold visit, EPA Mold Resources.