A method for washing metal masks using a cleaning liquid includes the steps of washing the metal masks before a solder printing process on printed circuit boards, washing the metal masks at least once during the solder printing process and washing the metal masks after completing the last solder printing...http://www.google.ca/patents/US5916858?utm_source=gb-gplus-sharePatent US5916858 - Liquid and method to clean metal masks for surface mounting technology
