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Search out Tim/oldblades on here he had a thread about using a Rotary tumbler IIRC
I'll check too when I get a few minutes for you...

Bingo, ...

First determine if the Etch is on, or in, the blade first,,, your thumbnail should tell you that,, if it is on the blade just about anything will take it off there so be very very careful...

Stu is giving you perfect advice...

Couple of hints with it

WD-40 instead of water with wet-r-dry paper, try it you'll like it..

Still without a doubt the best way to clean a blade gently...