nothing new with this, the only thing new would be if you can find any type agreement between, process, solder and mfging folks. The residue, in most cases, can be cleared by applying heat, you can use the standard heat gun, be careful not to linger too long in any one area to avoid burning, in test that I've be aware of in a former life, there was never a "reason" nor couldwould anyone accept responsibility. It would be interesting to know if you find the answer. ______________________________ Reply Separator _________________________________ Subject: [TN] ASSY:White residue after cleaning Author: "TechNet Mail Forum." <[log in to unmask]>, Larry Davis <[log in to unmask]> at SMTPLINK-HADCO