Peroxide (hydrogen peroxide) is commonly used as a bleaching agent for clothes and hair. In the context of Prison Break (referenced by 'cons' - convicts), the inmates used various chemicals for their escape plans, and peroxide was indeed used to bleach clothes white. Hydrogen chloride is corrosive, H2SO4 is sulfuric acid (too destructive), and CuPOSO4 is not a standard chemical formula.