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.

Thanks very much for the detailed answer and exactly what I was after (natural finish)

Time for the shifter to come apart for a good clean as some of it is quite rusty-

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Front changer given the evaporust treatment

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And

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Bloody hell! (switches tabs to amazon, orders a tub)

That stuff does the business, doesn't it?!

Now I'm gong to have to dismantle half the stuff I've stripped and serviced recently again, because now I know what all those steel nuts and bolts could look like...

Changing the bar tape to cotton.
Original bar ends are in very good condition.

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Shock stop

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from a leaflet I own

and another of my projects I have
mould opened by philip.knight, on Flickr

Nice, I'm surprised at the range of colours available for the bar ends on the price list - I'm not quite sure why though.

The reproduction bar ends - What colours are you making those in?

Coloured rubber products were readily available. Not all was black. This is further evidence of that.
I was waiting for the weather to warm up to work in the garage. The temp needs to be up for the urethane to cure correctly.
I have made the mould, just need to cast a few, then consider colours.

Bit more cleaning

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And

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Brake cable

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what cable outer is this? I need some for my simplex tour de france...?

ebay - 202468100043

the Nissen cable outers look good.
The cable outer above is sold in Italy for mopeds. But the seller refuses to post outside of Italy, so a roll was bought by a local, then posted to a collector in the USA and then I bought some from him.
It still available, if somewhat torturous to get it.

Let me know who is the seller.
Can get some for people here, bring it to UK and ship back. I go to Italy quite often to my girlfriend in Como.

Tape

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Neat

will you wrap top down with damp tape?

Yes - Top down but not dampened tape before, It sounds tricky.