TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Properties: The relative viscosity is 0.8-1.5, the syneresis value is 15-30%, the foam horizontal thickness half-life is at least 15 minutes, and the vertical-surface clingability is at least 10 minutes.Preferred Composition: The alkali metal hypochlorite is sodium hypochlorite, the alkaline builder is sodium hydroxide or potassium hydroxide and the surfactant is a cocamine oxide, sodium alkyl alkanoate or sodium dodecyl diphenyl disulfonate. The sodium hypochlorite concentration is at 1-15%, preferably 3-10%, and the surfactant concentration is 0.1-10 %, preferably 0.2-6%. The propellant is propane, n-butane, and/or isobutane, and amounts to 1-15% of the weight of the solution.Preferred Components: The solution also contains a calcium chelate of the disodium salt of ethylenediamine-tetraacetic acid dihydrate.Preferred Process: The prepared solution is loaded into an aerosol dispenser having a valve assembly, a mechanical breakup actuator and a push button actuator containing a dispenser outlet. A low-boiling hydrocarbon propellant is injected under pressure into the dispenser to form a mixture of solution and propellant. Vigorous agitation is performed by passing the mixture through the mechanical break-up actuator. EXAMPLE - A cleaning solution contained sodium hypochlorite (5%), sodium hydroxide alkaline builder (0.5%) to maintain the aqueous solution at a pH of at least 11, and Barlox 12 (RTM: cocamine oxide) (1.5%). The surfactant had a molecular weight of 249 and was a mixture of N,N-dimethyl-1-dodecylamine-N-oxide, N,N-dimethyl-1-tetradecyl-amine-N-oxide, and N,N-dimethyl-1-hexadecylamine-N-oxide. A 200 g portion of the solution was converted to fluid foam by mechanical agitation for 20 seconds. A liquid solution and fluid foam having the same composition were applied to side-by-side cleanability test panels for a landscaping timber stained with stubborn mildew. The fluid foam exhibited a cleanability (total color difference) of 14, while its corresponding liquid solution exhibited a cleanability of 4.1, yielding a foam advantage of 241%.