Posted by Gloria Robinson (161.235.202.160) on October 08, 2009 at 22:58:33:
The shingles on the front section of houses on one side of the street are discolored---looks like mildew has set-in deeply. However, I've noticed on my side at the back of my house the shingles are also becoming spotted. What causes this, and what/if any thing can be done to clean them up? Thanks.