The answer to 'why is my gutter greasy' is that gutters can become greasy and dirty due to a buildup of debris, oils, and other contaminants over time. This is a common issue that many homeowners face, especially in areas with a lot of trees or near busy roads.
Some common causes of greasy gutters include leaves, twigs, and other organic matter that accumulate and decompose, as well as airborne pollutants and oils from vehicles that get deposited in the gutters. This buildup can create a sticky, greasy residue that can be difficult to clean. If left unchecked, it can lead to clogged gutters and potential water damage to your home's foundation and landscaping.