The answer to 'why is my gutter dirty' is that gutters can become dirty and clogged over time due to a buildup of leaves, twigs, dirt, and other debris. This can happen gradually as debris accumulates in the gutter, or it can happen more quickly after a storm or heavy rainfall.
Some common causes of dirty gutters include nearby trees shedding leaves and branches, wind and rain blowing in debris, and a lack of regular gutter cleaning. Symptoms of a dirty gutter include water overflowing the sides, gutters sagging or pulling away from the home, and visible buildup of debris. To solve this issue, you'll need to clean out the gutters to remove the accumulated debris.