I'm having a nightmare of a time keeping my downspouts clean. House is 20'x40', gable roof, 4 or 5/12 pitch, one gutter on each 40' side. I have 3 massive trees that tower over the house, so the gutters and spouts get cleaned regularly. The gutters actually stay pretty clean, but the spouts clog every week or two. If there is a hard rain, it just starts spilling over the edge. The house had the perforated gutter screens which actually made things worse. My issue is that they clog with buds from the maple tree and/or leaves, to the point where water won't even enter the gutters, so I removed them. I've considered adding an extra spout on each side, about halfway down. Gutter sloping is correct, but this would help alleviate congestion on each spout. Are there any screens o could add that actually help?