Kit Rhett Aultman@whatshisays iRobot very briefly made them. They have little tank treads and a spinning soft drill on the front so they scoop the crud out as they slowly advance. But if the gutter is dented enough then obviously it can't advance without you going in and moving it...
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.