Ioan- Try methylene chloride; toulene or xylene will also work, but I'm not sure what effects it will have on FR4. Bill Davis, Sr. Scientist (408)-325-7868 [log in to unmask] -----Original Message----- From: Tempea, Ioan [mailto:[log in to unmask]] Sent: Wednesday, June 02, 1999 10:39 AM To: [log in to unmask] Subject: [TN] Fingerprints II Thanks a lot everybody for the strong response to my problem. Now I know this is a common problem and I fixed it with gloves. The problem number two is that I, however, have 20 assemblies that could serve in a criminalogy teaching class. Is there any way to clean them? I tried several substances I had around and Methyl Ethyl Ketone works the best. Will it damage the board (solder mask, joints, ICs, etc)? Thanks, Ioan ################################################################ 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################