polished my copper razor but can't get rid of polish residue

i used wright's copper polishing cream to polish up a copper razor.  now there's a lot of residue stuck in crevices that i can't buff out.  any sugguestions?

Old /used toothbrush & isopropyl alcohol .

Ketchup!!!… put it in a ziplock, leave in fridge for 30 minutes, wash it off, thats it

For tiny brush work, a G•U•M Proxabrush is real handy.


A hand for scale:

Use an electric toothbrush and some toothpaste. You will be amazed
At what the toothpaste will do.


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Y'all should make it clear whether you're ...

• suggesting a way to get the Wright's copper polishing cream residue off, or 
  
• suggesting an alternative polishing method to Wright's copper polishing cream