Does Rover window cleaner follow a fixed route or a random route?

It must be a fixed route. Cleaning the glass at random is inefficient. It can be seen from the development of sweeper that the random route is only used by sweeper 1.0. Window cleaner came out later than the sweeper, so it is necessary to move towards a more efficient cleaning method. When using Rover window cleaner, we can choose "N" mode, "Z" mode, or both modes, and then the machine will clean the window according to its own routine and rhythm of "wiping, wiping, scraping and wiping".