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Originally Posted by RSWORD
An important step in all of this process to definitely not forget is to add plenty of oil after any form of etching, polishing or anything of the sort. I recommend WD-40 as the first coat after a good polish or etch as it does a great job of expelling water molecules from the steel and really sinks into the pores of the metal. After a day or two of a good WD-40 soak, wipe away, clean area with acetone and then apply a light coat of gun oil to the area to conserve for longer periods of time.
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Salaams, For treating rust spots I use aluminium foil ... same as for using sandpaper ... it works at sub atomic levels apparently and the rust does vanish slowly. Use with just fingers and a few foil pieces folded in half... like a small wad.... and rub away. I get the same grey horrible result using lemon salt but the patina is coming back using olive oil and or gun oil . ( sewing machine oil )