That unmistakable smell hits you first. It’s earthy, musty, and persistent. Then you might see it: a dark, speckled pattern creeping up a baseboard in the basement or a fuzzy patch on the back of a closet wall. In the days or weeks following a plumbing leak, a roof leak during a heavy rainstorm, or even a minor flood, mold can become an unwelcome and unhealthy guest in your Washington DC...