First they clean your house...maybe even your pet rabbit. Then they figure out that everything needs cleaning but are kept down by the man and decide to cleance the universe. I recall a Star Trek Voyager (?) episode where an android gets all fucked up and kills everyone in the crew because they leave nasty stuff behind on everything they touch.
I can just picture the early prototypes being tested in an actual house, and something goes wrong and it just starts trashing everything. "Make it stop!" "I can't there's no override we did not think it would do this!" Eventually the US military is involved, and the robot is stopped but the whole block is in ruins.