Please continue to try these removers...someday one might actually work...

Here is what we have learned in the past with them,

They of course do not leave bright shiny steel...
They stain the steel either gray or black
They cannot remove the pitting
Since you have to sand for the pitting anyway why not sand the whole thing..
You have to sand off the staining.
Since you have to sand for the staining then why not sand for the pitting too and then why are we buying this stuff if we have to sand anyway...

Those are the results of past endeavors but like I said maybe sooner or later someone will find one that works even sorta good