During the 1980s the level of understanding about ozone depletion and various chemicals and gases that contributed to it grew rapidly. In 1987, leaders from many countries signed the Montreal Protocol on Substances that Deplete the Ozone Layer.
It established legally binding controls on the national production and consumption of ozone-depleting substances (ODS) and, if it continues to be successful, will significantly phase out production and consumption of ODS before the middle of this century.
With the implementation of the Montreal Protocol over time, restrictions or bans on the chemicals often used for high-level cleaning, including solvents like 1,1,1-trichlorethane, carbon tetrachloride (tetrachloromethane) and Freon, are increasing.
Organizations of all kinds need to find alternative cleaning methods that are effective without the use of harsh chemicals. Many are turning to ultrasonic technology.
Ultrasonic cleaning machines typically use water only, a water-based soap solution or a mild solvent. This largely depends on the material of the item to be cleaned or the contaminant being cleaned from it.