Believe this or not, but I have seen debris build up on these gutters also.
remember, all it takes is one Piece of Contraband to hang up on the louvers and they you will have a log jam.
But, if this does occur, they seem easy to clean off from the ground level.
Also, due to their delicate construction, make sure that you do not have any swing branches around the system that could bump or hit the gutter, they will bend and become useless.
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