Abstract: This invention discloses alkaline detergent compositions for cleaning solid surfaces including returnable food and beverage containers such as are used for milk, ice cream mixes, soft drinks and similar materials. The alkaline detergent compositions are particularly adapted for cleaning bottles fabricated from polycarbonate resins without damaging the polycarbonate but are also useful on glass, polypropylene and polyethylene surfaces. Granular detergents, aqueous concentrates and aqueous use solutions are described. The alkaline detergents can be used in mechanical spray or soak-tank washers.