The product with the highest concentration of phosphoric acid for the money I've found is Behr concrete and masonry etcher sold at home cheapo for about $15 a gallon. You can dilute it down more to what works pour some on and then pour the rest back in the jug.
Scotty has mentioned some and others include evaporust and similar products. According to the msds sheets on those products listed with the epa, the behr stuff has the highest concentration that I have found.
There ought to be a source for pure phosphoric acid by the gallon just like they sell muratic (hydrochloric) acid but I have found it. I'm sure the places that paint and powder coat lots of metal must buy it by the drum somewhere. But then maybe the painters don't use it since it changes the surface of the metal.
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