Don't forget, anodising is not merely a coating like paint or powdercoat, it actually modifies the material. Approx 50% of the anno thickness is growth above the pre-treatment surface, and 50% is etched into the old surface. If it's a decent anodising job, there'll be a reasonable amount of material you'll have to remove. If it's hard anodised, you'll not do it satisfactorially at home without ruining the object.
Good luck!
Cheers,
Jason.
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