Hello all just starting a window cleaning round to go with my all ready established bin cleaning round I'm looking to use the traditional method as the demand seems higher with my current client base I'm confident on a ladder but my no means superman so some windows are a no go so have bought a backpack for pure water and a water fed pole excuse my amateur question but when cleaning top floor windows with a brush I notice you get a lot of drip down which if there's a window directly below will drip on the glass will this contaminate the glass that I've already traditionally cleaned? Or is there a way to avoid this going live of wednesday so don't want to look like a complete amateur thanks