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chez_jay
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