No matter what type of gutter system you have, it must be kept clean and free of any obstructions. Even if you have screens, small partials from your roof will get through and eventually clog your drainage system. This will not only cause damage to the roofline, but your foundation as well.
Proper maintenance of gutters is a dangerous job. Trained professionals with the proper equipment should only do it.
We-Do Windows does a thorough job every time – we even hand wash the outside of gutters.