Smart Sonic Stencil Cleaning Process in 1990, the process has been evaluated and tested by recognized experts in the filed of surface mount technology and by authoritative regulating agencies such as EPA, Cal/EPA and AQMD. No other process in the electronics industry has met these high standards or been renowned by so many, effective, fast, economical and environmentally correct. Guaranteed to clean any type of solder paste from any fine-pitch stencil.