Re-Passifying Stainless Steel

Hi, I think I saw some postings on this subject before. It has recently come to my attention that my method for cleaning up my 1/2 barrell kegs (using the 3M green scrubby pads) actually takes off some of the SS protective coating. I am curious if I can re-passify teh SS by using phosphoric acid. Does anyone know the "recipe" for doing this? I have not noticed any off flavors, or oxidation as of yet, but was curious of others' opinions of this etc., and if it is a reasonable course of action to pursue ... Thanks, WH WindRiver Brewing __________________________________________________ Do You Yahoo!? Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1