This is not a cleaner but rather a window dryer. If the surface is dirty, it will not clean it. It has to be wet (see washed) and then it dries (almost) without trace. There can therefore be used alone (that is unfortunate is that I understood). The charging time is 2 hours to just 20 minutes of autonomy :-( Certainly it dries very well but make his tiles in 20 minutes, it's impossible mission for me.
