Houses & Buildings are cleaned with a LOW pressure spray (Soft Wash) that will NOT harm or damage them, but will kill and remove mold, mildew, dirt and bugs. I understand how important your plants are, the vegetation on the grounds will be sprayed with water so that any detergent that might come in contact with it will run off. Then a light detergent is sprayed onto the house and left to sit for a couple minutes. Finally, I rinse the house and the vegetation to clean everything off. This will remove the dirt build up and the green algae on the siding & bricks.