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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.

If you do end up with frozen gutters, it's important to thaw them correctly. Thawing your gutters slowly is far safer than trying to break apart the ice. Once you get through the ice, bring in a gutter professional to check out the effectiveness of your heated system.

Shingle granules can be cleaned out of gutters using a small scoop or a hose, depending on the quantity of granules and how much other debris is in your gutters. First, clear your gutters of leaves and other debris. This may remove granules in the gutters if they are mixed in with the debris. Use a plastic scoop to remove larger quantities of granules or a hose with a high-powered nozzle for smaller amounts, and collect and dispose of the granules once they’ve been removed.

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.