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.

It’s recommended that you clean your gutters after a severe storm, however, regular storms don’t raise the same concerns. Look for signs your gutter might need cleaning after a harsh storm. Do you see broken branches and excessive leaves all over your yard? Chances are your gutters caught quite some debris. Also, ensure a few drying days before cleaning your gutters. Dry debris is much easier to clean.

Any small amount of standing water can be damaging to your gutters. It’s recommended that a ¼ inch puddle or more should be addressed. Failure to keep water from pooling in your gutters can result in clogs, algae growth, and pests that damage your gutters over time. 

Yes, it is generally considered safe to use a leaf blower to clear debris from gutters as long as you are wearing safety goggles and gloves. It's also necessary to have a gutter extension tool. In cases of severe clogs, it's necessary to manually clear debris that cannot be removed by the pressure of the leaf blower. Homeowners should be aware that the incredible power and speed of the output of a leaf blower can blow debris into downspouts. When this happens, water won't be able to flow through the gutters properly. For this reason, many homeowners hire professional gutter cleaners.