On Fri, 22 Feb 2013 15:34:21 -0500, Stormin Mormon wrote:

Used to be you could buy rust remover jelly.

I called ACE Hardware and they have it in stock for less than $10 a bottle.

Looking up sources of phosphoric acid, I see I can also buy 85% H3PO4
at about $13/Liter or $40/gallon (which makes a ton of naval jelly).
http://www.dudadiesel.com/search.php...ng _id=17:30:

Here is another source of H3PO4 at $50/gallon:
http://www.interstateproducts.com/1_...er_pricing.htm

Here's a source of "Aqua Mix Phosphoric Acid Cleaner Substitute"
http://www.amazon.com/gp/product/B00...624253-4972718
The MSDS says it's Urea, monohydrochloride 7-13%
http://www.ptsaquamix.com/index.php?...externalId=487
Hmm. I wonder if peeing will work on the rust!