The iRobot Looj is a gutter-cleaning robot from iRobot, makers of the Roomba Robotic Vacuum. It's again on sale at Amazon for $71.55, matching the all-time low that we've seen. 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 KS, KY, ND, NY, WA).