Yes, gutters can still get clogged even with gutter guards installed. While guards significantly reduce the amount of debris that enters your gutters, they are not 100% effective.

Small debris such as pine needles, seedlings, algae, small leaves, and pebbles can pass through the guard's screen or mesh and accumulate over time. Clogs can also form if the guards themselves are not cleaned and become overwhelmed with debris on top, preventing water from entering the gutter.

If this buildup is neglected, it can lead to clogs, water leaks, mold growth, and even plants sprouting from the gutters. The primary benefit of gutter guards is not the complete elimination of maintenance, but a dramatic reduction in how often you need to perform it, often from several times a year to just once a year or less.

Absolutely—and lots of it. Overflowing water from your gutters can damage your siding and your roof. All of the moisture getting into the cracks and crevices of your home can lead to mold or mildew problems down the line. In addition, when water pools around your home, it needs a place to go—and sometimes it ends up inside the house, creating a very unwanted flood.

The kind of gutter guards you have will affect how often you need to clean them. The more basic type of gutter screen requires cleaning once or twice a year. With a micromesh screen, you may be able to extend the time between cleanings to every two years or so.

However, if you have trees near your roof, you’ll need to clean your gutters more frequently, especially if you have chicken-wire or colander-type gutter guards. If you have pine trees near your roof, you may even need to clean your gutters quarterly, as tiny pine needles can get through any type of gutter guard.

Whether or not you can use a pressure washer to clean your gutter guards depends on the type of gutter guard you have and the strength of the pressure washer. Most gutter guards can handle a low-pressure setting but check first. If you’re unsure if your gutter guard is designed for pressure washing, check your manufacturer’s instructions, ask a pro, or use a garden hose to clean the gutter guard instead. As gutter guards age, they become less resistant to the strong forces of a power washer, so treat older gutter guards with more care.