I used to have good success with a wire wheel and a motor with a lot of torque so I could bear into it hard. If the surface is flat, a disc grinder would probably work best. Bead blasting and buffing will still tend to leave an impression, depending on how deep the etch is.
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Oz
"I went to one of those so-called 'All you can eat' buffets last night, and I'm on to their little game.
They stop filling up the thousand island bucket after you empty it three or four times." http://www.freespeech.org/oz/
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