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I've removed the anodising from quite a few things over the years.
Most recently these cranks - https://www.lfgss.com/comments/15683861/I used caustic soda crystals. Start small with a teaspoonful in about 250ml of water, the reaction starts quite quickly. I used a small brush to daub it onto the cranks and let it sit for 30ish seconds, rinse it off and repeat until all the anodising is gone.
Experiment with different strength solutions, I've done it a good few times and feel comfortable using a stronger solution than above that has the anodising run off almost instantly. Obviously you don't want to dissolve any parts, so rinse frequently.Do it somewhere well ventilated, it gives off some pungent fumes. I usually do it in the kitchen by the open back door.
It's not that scary, just takes a bit of trial and error. If your cranks disappear then you know you've done it wrong.
TotalShanner-
Hmmm caustic soda crystals is natriumhydroxide pellets as linked too.
I planned on dumping them in the solution, your solution with the brush is more foolproof.
Catch is though that my gxp cranks have an attached steel axle and as per tester it runs into the pressed cavity between aluminium and steel which is hard to rinse out so just keeps on dissolving the alu from the axle.I can do a middle ground; keep away from axle and do the ends to save myself from sanding the whole thing.
I'll have an experiment at the weekend to see. Many thanks for your comment too
Rodolfo
Many thanks for the elaborate answer!
Seems a lot less straightforward and more dangerous then the interwebz "chuck it in chemical solution X, watch anodising bubble off, rinse, rub, rinse, result."
I'll resort to the plain old mechanical solution of elbow grease and wetndry so I will probably end up with more flesh (callus) then less (stumpy fingers) which is my preferred alternative.