River rock shower floors are crafted from rounded, polished stones. Like other types of shower flooring, including tiles and fiberglass, river rocks become dirty with use. Unlike tiles and fiberglass, however, which can generally be cleaned with a standard household cleaner, river rock is a porous material that can be damaged by chemical cleaners. The safe way to clean river rock without damage is to remove the dirt naturally with steam.
Wipe the floors with a towel to dry and clean dust from the surface. If the floor is already dry, go over it with a tack cloth to pick up any dust from the surface.
Slide the brush attachment onto the hose of the steam cleaner.
Fill the water reservoir on the steam cleaner.
Plug in the steam cleaner and put it on a mid setting on the temperature dial. When steam starts to come out of the hose, start at one corner of the shower floor and run the steam cleaner slowly over the river rock. Do a 6-inch square of the floor, and then stop.
Rub the area you steamed with a clean, dry rag. The rag picks up the dirt loosened by the steamer.
Clean the entire river rock shower floor with this method. Stop every 6 inches to wipe the floor, and get a new rag when the old one becomes dirty.