Do you polish by hand or use some sort of power buffer?
Depends. I have special discs for my angle grinder and special stuff for my drilling machine.
If there are deeper scratches in the surfaces I grind them in many (1-8 (depends))steps out.
Then I use mostly my grinder with special polish discs with 2-3 polish waxes.
Finish always by hand.
For stuff with no scratches and less oxidation I often use just metal polish, polished by hand.
(E.g. legs)
For enamel I use paint cleaner (same as for cars)
Metal polish : Meguiars NXT metal polish
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