Mint is a new floor-cleaning robot that can wipe down hard surfaces with dust cloths. How does it stack up to iRobot's Scooba? Newcomer Mint, at right, is smaller and lighter than iRobot's Scooba. But can it clean floors as well? But Evolution Robotics'Mintis one of a number of floor-cleaning robots designed to lighten the housework load. Mint is somewhat comparable to low-cost dusting robots like the $50RoboMop, but at $249 it's almost in the same league as more sophisticated floor-washing machines like iRobot'sScooba.