FOAM CLEANING
Foam is a bunch of tiny bubbles created by foaming agents. The purpose of foam is to provide contact time on a soiled surface to allow the wetting agents, detergents and degreasers enough time to do their jobs. The contact time in which the foam remains on the surface is dependant upon the size of bubbles produced, as each bubble burst it releases detergent that is used to clean the surface, so its better to have lots of small bubbles rather than some large bubbles, that would burst quite quickly, and run off the surface before releasing their detergents.