A few weeks back we experienced a wave process problem where we received deposits on our pcb. At first we though it was dedrites but after an outside analysis of the deposits they were found to be tin. We have tried to remove the deposits with brushes, heat, and cleaning agents. So far the only thing that we have found that works is running the board back over the wave. The problem with this is that our product has a gas plasma display on the solderside that wraps around from the front. We currently do not have a fixture capable of supporting the display through the wave to maintain position, with the pcb depanelized. So I would like to consider this my last alternative.

My question to the forum is there any chemical availible that will remove the tin deposits without etching, delaminating,...etc. the pcb?