Cleaning formulations suitable for cleaning equipment which circulates food products, such as dairy products, in place. The formulations are alkaline compositions containing a source of available chlorine (suitably hypochlorite) and including a mixture of surfactants one of which is a C.sub.4 -C.sub.6 alkylated diphenyloxide sulfonate and the other of which is a nonionic surfactant which is stable in the formulation within certain concentration ranges and which acts to suppress foaming.