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Originally Posted by Grand73Am
I've never had a film with 579, doing it the way I wrote. The water is what neutralizes the 579. Then do the 520 and the rinse and dry and the surface will be nice and clean. No need for any other chemicals, unless you let it sit around and get handled and dirty, and then you'd have to wipe it with a pre-cleaner.
A long time ago, I used a rust cleaner that left a film, maybe Ospho, and I didn't like that at all and quit using it. I wouldn't use anything that leaves a film.
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The 520 leaves a film. It leaves a zinc phosphate coating on steel.