Thick wall to wall carpets and padding will have to be discarded or professionally treated. Rinse the walls from several inches above the highest level the water reached to the floor. Carefully hose behind any base coping to remove all soil. Hose down the entire floor. Smaller items may be immersed in this solution.
Hand scrub larger items with the solution.
Pour this solution on the walls several inches up from the highest level reached by the flood waters and over the entire floor. Make sure all affected surfaces have been contacted with the solution. An effective method is to use a broom or mop to splash the solution on the walls and over all of the floor. Please consult an expert. Cut off the portion of the drywall which has become wet.