Exhausted
First thing is to remove the engine protection plate and make sure that your pipes are stainless steel.
Wet and Dry paper start with 600 if they are bad then 1000 followed by 2000, use Autosol as the lubricant.
Once this part is finished you will need much elbow grease using Autosol and many rags to buff up the stainless steel, it’s a messy job so wear gloves.
I find using old fluffy socks over your hands are great for polishing.
You will get a sweat on but you will get a great result