I know we have talked about this before, but on shining up the aluminum:
The original aluminum on the exterior trim is clear anodized
To polish the aluminum you would have to abrade through the coating or chemical strip it
I have not personally tired to do that
Then you can polish
If you don't coat the aluminum after a while it will turn dull and grey
To slow or prevent that you can coat it
You can just re-polish it now and then, but that is difficult when a small part is on the car
Your can coat it to slow or stop the dulling
Some of your choices are, clear paint, clear ceramic coating 'Ceracote', or wax
Don't do clear paint, that isn't really a choice, it will look like clear paint and will probably yellow
Wax is easy and reversible
Most durable, looks great, is Ceracote, but it is not easy to apply
They do make a DIY kit, never tired it
Even 'professional' places can screw up Ceracote, and it is almost impossible to get off