The answer to 'gutter odor' is that common causes include debris buildup, animal nests, and mold or mildew growth. Symptoms may include a foul, musty smell coming from the gutters. Solutions can range from simple DIY gutter cleaning to professional gutter maintenance and repair, depending on the severity of the issue.
If the odor is mild and the gutters are just lightly clogged with leaves and twigs, you can often resolve it by doing a thorough gutter cleaning yourself. However, if the odor is strong, the gutters are heavily clogged, or there are signs of mold or animal infestations, it's best to call in a professional gutter cleaning service to properly inspect and clean the system.