Also I would add that using a Dremmel with a polishing head and Autosol will help to get a shine on an aluminium filler cap
Certainly easier to get a shine than doing it my hand
Personally I like a hand job.
I rather like polishing the filler cap, Autosol or Silvo and then a final coat of Megs Alloy cleaner with wax. I've even been known to clean the factory's hire car caps!
A dull filler cap is simply offensive...
And a hand job is far more controlled than a machine, it really isn't a good idea to get Autosol all over the paint.
Why?
Because then you have to polish the body work again, which risks getting polish on the filler cap..
And then you have to re-polish the filler cap....
A bit like the "never ending story", trapped to all eternity alternately polishing body, cap, body, cap.....
