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. Prepare the bleach solution of one cup of household bleach to one gallon of water . Smaller items may be immersed in the 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 splach the solution on the walls and all over the floor. If water has reached more than a few inches up the walls, hollow walls will have to be opened. Cut off the portion of the drywall which has become wet.