Or does plasma cleaning help because it removed a top layer of crosslinked resist so that the developer can attack the "virgin" layer? Is that the premise? rmartin@systron.com writes: Hi Brad/Bill, I am totally intrigued by your suggestions. How does plasma cleaning help development? Does it reverse the cross-linking that occurs? Again, our aim was to re-expose used resist and strip it off by development. The issue is that a top layer of that resist has been cross-linked (based on development behavior) and in some instances, leave residue on the wafer. Your thoughts are appreciated.