Kathie, If you're already recording various readings on your cleaner and cleanliness testing, then what does your data show? That should at least point you in the right direction to see what is more critical or has higher variability. B. Ellis made a very good point of comparing apples to apples off the Omegameter. For the vapor degreaser I'd think solvent quality and time in vapor might be a good place to start. Not familiar with your equipment but: Do you cold spray prior to removing parts - manual spraying isn't that repeatable. Do you have a lot of dragout from your semi-aqueous cleaner and how is concentration maintained...auto metering, manually replenished? Regards, Mike Sewell ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################