If you want to try and save them from that,
Get some APC. I'm not a brand whore, so whatever is clever for you. The one I use is at Home Depot, and if you mix yellow and blue, it's kinda simple what color it is.
Get a Brush. Also found at Home Depot in the cleaning aisle. Long or short handled, stiff nylon hair.
Grab a hose. Turn the water on too.
Soak in APC.
Shoot more APC down.