Currently we accept no clean assembly as long as we can not see stain
mark or powder residue on the assembly within 2 feet after the wave
soldering process.  What is yours like?
 Is there a need to check for contamination level on no clean assembly?
If the answer is yes, then what measurement should I test it against?
What tester in the market does serve this function?
 The reason why i ask the question is because I heard that even no clean
flux does contain small amount of corrosive material, thus can affect
the product in long run.
Thank you

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