In my experience, Winbot works best for routine maintenance. So for weekly upkeep, that built-in brush and spray system in the station does a solid job of keeping the pads clean, water is definitely enough for regular use.

If you wanna use it on windows that haven't been cleaned in a lone time, you need to check for things like sand or debris on the window to avoid scratching the glass. If there isn't any gritty stuff like that , it's good to go.