There are two problems here. One is lime deposits and that is easy to handle with any weak acid (do NOT use HCl in stainless steel, though). I recommend dilute formic acid, but it requires careful handling (see MSDS). The other is deposits from the solder paste/flux/wash chemistry and they can be very difficult to remove, depending what chemicals are involved. Possibly the worst product is hydrolysed rosin which forms a white crud that sticks to anything and is insoluble in most ordinary products likely to be found in an electronics workshop. I think the only thing to do with it is to scrub it with an IPA saturated cloth, with plenty of elbow grease and patience. Do NOT use abrasives, such as Scotchbrite pads or pumice, as they will roughen the surface of the stainless steel, providing a nice key for thicker future deposits. Maybe we need Teflon/Silverstone coated machines!!! Brian Richard Kraszewski wrote: > To ~continue along this forum's recent cleaning track... > > What are you using for de-scaling water wash systems? > > Any recommendations would be appreciated. > > Rich K / GTS > > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------