Have you tried polishing with toothpaste on a small part to see if that works?
It's very good for lifting silver oxide from silver and tarnish from pewter, maybe will do a job on alu too?
I'll give it a go, annoying there isn't a nice easy fix... I'm not go full Campag seatpost on it, that guy's dead... 🙃
@deleted started
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Have you tried polishing with toothpaste on a small part to see if that works?
It's very good for lifting silver oxide from silver and tarnish from pewter, maybe will do a job on alu too?