Grace-Foam is the biggest one among the machines working with the Foam-Rinse-Vacuum system, patented by Santoemma. This machine allows the cleaning and sanitising of many kinds of surfaces through the spraying of foam, rinsing and vacuuming. Grace Foam is indicated for big places. The cleaning process is carried out through four stages: 1. Spraying of the detergent foam on the surfaces to be cleaned (walls, sanitary fixtures and panes), 2. Foam chemical action 3. Rinsing with fresh water 4. Vacuuming of residual water.