Ok, so assume I want to nicely polish the RX100 groupset I have on this Bianchi I picked up. Something like this:



How do I polish the alloy nicely without affecting the RX100 panto? I know Mother's won't do a lot to it but I don't want to dull it in any way. Polish lightly over it then mask it with tape and go to town on the rest?

Is there a trick?