A spray solution generates a foam to sanitize surfaces. The spray dip solution is a mixture of the solution with carbon dioxide and nitrous oxide in a closed vessel. After ejecting the liquid dip solution mixture from a nozzle a foam is generated from the solution as the solution hits a surface. The spray can be applied to a number of different surfaces. In an embodiment of the invention, the spray can be applied to cow teats without risk of cross-contamination of the nozzle or other equipment. The generated foam remains intact on the teat for a prolonged period of time, increases the area of the teat in contact with the foam during the treatment period and disperses skin-conditioning fats present in the dip treatment, thereby increasing the coverage of the skin conditioner on and within the epidermis of the teat and surrounding areas.