Be aware that Parkerizing is porous and not easily dissolved. If you use, for example Naval Jelly, it will penetrate the Parkerizing and etch the metal underneath before it dissolves the Parkerizing. I have tried a few chemicals, but everything has ended up in a jelly-like Parkerizing with badly etched metal underneath. The only sure way I know of is with abrasives, but I'm all ears if anybody knows of any chemicals that will do the job.
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