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The iRobot Looj is a gutter-cleaning robot from iRobot, makers of the Roomba Robotic Vacuum. It's on sale at Amazon for $99.99, the lowest price available. This machine rolls through your gutters on treads while its brush propeller blasts out leaves and sludge. It is usable with K-style, aluminum, copper, metal, and vinyl gutters, and cleans out 60 feet in 10 minutes. Shipping is free and there's no sales tax (except NY, KS, ND, WA).