We use reverse osmosis de-ionization process that purifies the normal tap water and turns it into pure water for window cleaning. The pure water does not harm/affect the shrubs or flower. To clean the siding we use normal tap water and this too does not affect the flowers, in fact, it waters the plants as we wash. As our technicians are working around your home, they take the utmost care not to walk on the flowers, drag the water hoses or cleaning equipment on the shrubs and flowers.