-Why are there black streaks on my gutters?

Established in 1998, Gutterworks Mfg, Inc. (Formally Front Street Manufacturing, Inc.) was founded on the ideas of becoming industry leaders for residential and commercial gutter supplies and downspout components with an emphasis on niche market items in a wide array of colors. In an effort to offer our customers easy and convenient access to all of our quality built products 24 hours a day 7 days a week, we established www.gutterworks.com. Thank You for visiting our website we look forward to the opportunity to do business together.