How about the use of hot water to dissolve the fixer..... and or..... For use of acids on plastics, I really do not know if it is a good idea or not.... gases, toxicity, and death might be the cost for clean tanks... Why not use a chemical cleaner like that used on C41 minilabs.... that would be my first shot.....find a friendly lab, and buy some of their cleaner Frank Filippone red735i@xxxxxxxxxxxxx -----Original Message----- I have wiped most of the silvery gunk from the tanks but wondered if minute residues will affect their use in a C 41 process. Any ideas, people? And as for the fixer crud - I think the tanks will be fine if I can get it off. Will conventional acids like hydrochloric or sulphuric do it or do I need to go more exotic? Uncle Dick ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.