A S Gillott - L'Atlantique (I think)

Short answer: Aluminium cleaner from your car parts retailer.

Long answer:
The debate as to whether to preserve or enhance.
Often we see items better than when they were new. For alloy parts, the casting marks can be removed with a little time and effort not afforded at the factory. Later abrasions can be sanded back then buffed up. With a little time, a mirror finish can be achieved.
It depends on what finish I am after (because it is my bike, I get to make the choices).
A few months ago I did my GB Superhoods/Coureur brakes.

I was going for a more natural finish.
A soak in a kerosene bath to loosen years of crud, then into the ultrasonic cleaner.
The steel parts had the Evaporust treatment.
The alloy parts then had a quick treatment with an aluminium cleaner. Read the instructions as it works within a short time!
The link to the cleaner I used, you would need to find your own locally available product.
I bought it from the dominant car parts retailer in Australia.
I then wiped each part with a cloth and I liked the result. This was the limit of polishing. A wipe with a cloth.
Then reassembled the parts and used the oily rag to achieve a thin coat of protection.

Now to order the spokes so I can get the proper wheels built, adjust the brakes and then ride it.