Abstract: A method for removing residual polyurethane precursor components and foam from the interior of a polyurethane foam dispensing means prior to the solidification of said components, said means comprising a plurality of controllable feed tubes, said tubes being adapted for transporting and selectively introducing the precursor components into the interior of said dispensing means, said method comprising introducing a cleaning composition into the interior of said dispensing means to remove substantially all of the polyurethane foam precursor components and foam, said cleaning composition being at a temperature of at least 80.degree. F. upon its introduction into said dispensing means and comprising water free of other solvents.

Abstract: A foam dispenser for converting a plurality of foam components into an expanded foam that can be cleaned with compressed gas after the foam is discharged and which is distinguished by the use of a center plug having discrete passages to separate the various foam components until the components enter a detachable mixing chamber located external to the dispenser barrel.

Abstract: A foam dispenser for converting a plurality of foam components into an expanded foam which can be flushed with a cleaning solution after the foam is discharged is distinguished by the use of a rotary valve member corresponding to each foam component introduced into the dispenser to constitute the expanded foam. Each rotary valve member has a single passageway and is mounted for movement between positions in which (a) the passageway communicates with the tube carrying the foam component and (b) the passageway communicates with a tube carrying the cleaning solution, thus permitting cleaning of the dispenser at all points downstream of where the foam components enter the valve. The distance between where the foam component is introduced into the dispenser and the point where the foam component enters the valve is so short that no significant amounts of buildup of the foam component can occur.