http://www.ptadiprotek-envirodunia.com/pmain.php?id_hal=36
AC500, a phosphoric acid cleaner, is for sale at GIS. This particular cleaner is utilized in the support of fabrication and maintenance of equipment, supplies, and components throughout most shops. Equipment such as milling machines, lathes, drill presses, band saws, grinders, shears, sanders, punches, breaks, benders, grit blasters, and parts cleaners can all benefit from using AC500.
AC500 is used in metal cleaning, both for parts and machinery. It can be used as an anti-foamer in the textile, paper-making, coating, and waste water treatment industries. For use with ultrasonics, metal cleaning, chemical cleaning, and precision cleaning, AC500 already has excellent word-of-mouth throughout the community!
It has a long shelf-life, there is no unpleasant smell, and MSDS is available upon request!
http://msds.ihs.com/partinfo.aspx?partid=46466
AC500 $49 per gallon in stock at
EDM Tech Center 763-315-9104
http://www.edmtechcenter.com/
At that price, only if you are getting it for free?
Ferric Chloride is pretty cheap compared to that.