There was an excellent paper at the last IPC meeting by Jill Steeper of
Shipley titled  " Bacterial Contamination of Chemistries Used in PWB
Manufacture or Are there bugs in your process " that you might want to read
.  She is at  1-508-229-7345 I believe.
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From: Andy RJ McKean
To: [log in to unmask]
Subject: [TECHNET] Micro-organisms in rinses