Provided herein is a method of peroxide activation which comprises combining (1) an aqueous bleaching solution with hydrogen peroxide base, and (2) an aqueous solution containing as major components a sufficient amount of dicyandiamide for hydrogen peroxide activation, and an organic builder and/or inorganic builder, and maintaining the combined solution at alkaline pH. These solutions are stable when stored in separate containers. As needed, the solutions are mixed together. This invention is effective for bleaching soil and for removing mold, applicable for cleaning, bleaching, sterilizing or deodorizing in either domestic or industrial use.