The answer to 'why is my gutter grimy' is that gutters can become dirty and clogged over time due to a buildup of leaves, twigs, dirt, and other debris. This can lead to a grimy, unattractive appearance in your gutters. Common causes include nearby trees shedding leaves, wind-blown debris, and general environmental factors.
Symptoms of a grimy gutter include visible grime, buildup, and discoloration. If left uncleaned, this can cause water to back up and overflow, leading to potential water damage to your home's exterior and foundation. The best solution is to regularly clean and maintain your gutters to keep them functioning properly and looking their best.