In a message dated 97-08-12 19:13:37 EDT, you write: > After soaking for 20-30 minutes, the PCB asseblies are cleaned >in a Westek Triton high pressure in-line D.I. water cleaner. > >We use this procedure to remove hard to clean white residues (both No >Clean and Water Soluable fluxes) and solder balls associated with the No >Clean processes in general (reflow/wave). This should also work for >cleaning baked on fluxes. Suspect that it does not. When you bake, you oxidize, and react the organics in the flux with the oxides of the metals (Tin and Lead?) and form organometallics, which are usually insoluble, thus essentially impossible to remove, in anything. Suspect that to remove them will take a chelated aqueous saponifier. If you need a source for this, contact me off line please. Rudy Sedlak phone 650-962-8004 fax 650-962-0370