Guardian Service Cleaner, Cardboard

Guardian Service Cleaner Cardboard  New old stock, label shows some age.  At back top is a piece of tape that will remover part of label, so left it.  An old-fashioned scouring powder or cleaner.  Made and sold by Century Metalcraft Corporation of Los Angeles, California.  This cleaner dates back to at least the 1930s, based on the original 25 cent price and cardboard-type container.