Robots that can kill germs are nothing new. They rely on UV-C light to get rid of 99.99% of dangerous germs and bacteria at hospitals and other sensitive environments. The Degerminator Robot is another one that uses a 60W UV germicidal lamp to disinfect. It has 4 wheels and autonomous navigation with the help of a LiDAR sensor.
The robot moves the lamp around to cover a lot of space. More info is available here.