A powdered detergent formulated for the refurbishment of glassware. Can also be used, in the pre-treatment of new glassware to remove all traces of chemicals used in glass manufacture, especially mould-release agents. The head retention and lacing characteristics of beers will be maximized. May be used as an aid to the normal maintenance cleaning of cabinet and rotary brush type glass washing machines where the detergent action of the product will benefit the machine interior.