Most people underestimate the importance of clean gutters, but in terms of roof management, having clean gutters can be one of the most aspects. This is because gutters serve the purpose of carrying water away from the roof and building envelope. If they fail to serve this purpose, then you could have water building up on the roof, which will massively reduce the lifespan of a roof, which is a bad case, and more typically you’ll have water dripping straight down from the roof, splashing back onto the building and eroding its envelope.
Gutters should be cleaned pretty regularly, although the period between cleaning will depend upon a number of environmental factors (like if there are trees nearby), but every year is a good number. It can be quite a dangerous task though, so unless you have the correct tools to do it, paying for a gutter cleaning service becomes your best option.