+1 for what Rollo says.
I get all my polishing stuff from
https://www.metalpolishingsupplies.c...olishing-kits/
For scratches and deep corrosion start with a flap wheel, say 120, or 80 if it's a stubborn mark, then back to 120, then the polishing mop regime.
I have a heavy duty 1/2" chuck drill that I can mount in a vice, that has enough power to spin the 6" mops. I've built up a collection of mops and soaps for alloy and steel too.
I keep the same soap on any one mop.
Get a Stainless Steel kit and follow the instructions, they work well.
Taking the pipes off once a year does no harm. I swapped the nuts for S/S dome nuts and use plenty of coppaslip on the studs, swap the pinch bolt on the rear pipe for S/S too. I also keep a stock of the sealing washers as they are cheap.
Once they are shiny they are a complete piece of Pistachio to keep clean.
I have cast exhaust clamps which I use Graphite stove polish on (used to be Zebrite, not sure if that's still available). Dead easy to touch up mid season.