Ruben--It is important to understand that No-Clean means just that--NO CLEANING. The residue from a no-clean process that is properly implemented will be inert and NOT cause any degradation when left on the PCB. It is very common to see the white residue as a result of trying to remove no-clean residue with alcohol. If you WANT to clean, you should be using a cleanable low-residue (non-rosin) flux. Talk with your flux supplier. Jack Jack Crawford, IPC Project Manger - Assembly 2215 Sanders Road, Northbrook IL 60062-6135 [log in to unmask] http://www.ipc.org 847-509-9700 x 393 fax 847-509-9798 >>> Ruben Irizarry <[log in to unmask]> 02/12/98 11:40AM >>> Hi everybody I am having a problem, and it is that we used to use Water soluble paste in the past and for that we used Alcohol to clean reworked boards. Now we are in No-Clean and if we use alcohol there are some white residues that sometimes bothers me a lot. Could somebody tell me more about this white residues, how can I clean them, what can I use, are they acceptable. This is urgent to me I will appreciate all your help. Gracias, Rub?n E. Irizarry-Guzm?n Operations Engineer ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ 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://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ 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://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################