The parts you describe are anodized from factory and it's not possible to actually polish them like one normally would with aluminium.
If your determined to polish those components, the best results will be with a gentle polish that's most suitable for anodizing.
Some metal polishes are not kind to anodizing, and one needs to be a little cautious, as anodizing is intended as a highly durable and maintenance free protective coating on the aluminium.
Ideally it should be preserved/retained as much as possible. Polishing only serves to progressively remove this protective coating.
I would contact the Autosol distributors directly in your market, and ask them what they recommend out of their product range in this application.
I would normally make a recommendation, but the Autosol range has been in a state of flux over the last couple of years and it varies a bit as to what's available in different markets around the world.
Seriously though, I have never polished mine in over 2 years and the parts you describe look exactly the same as when the bike was new.
I personally consider them to be maintenance free.
You don't need to do anything other than a normal wash and wipe down, and of course some regular lubrication of the movable parts