A method and apparatus for cleaning workpieces, particularly printed circuit boards upon which electrical components have been soldered, is capable of using a potentially flammable or explosive liquid cleaning solvent. In one embodiment, there are two immersion wash stages between which is a spray wash...http://www.google.com.au/patents/US5045120?utm_source=gb-gplus-sharePatent US5045120 - Method for cleaning electronic and other devices
