In article , Steve Barker
says...

On 8/2/2011 12:03 PM, john thompson wrote:

Is it possible to buy a small fairly inexpensive 'sand blaster' that would
do the job? Or even some kind of paint stripper, either of which would not
damage the aluminium surface?

Grateful for advice on how you might tackle this job.

find a shop that blasts with walnut or pecan shells. I think you'll be
very happy with the results.

Providing the OP doesn't have one of these modern, trendy 'nut
allergies' of course.

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Pip: Keeper of the Cable Ties