Here is a full tutorial of restoring an exhaust like a new one.
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Other instructions:
Begin with sandpaper grain 80 or 100 and a steel brush.
Go to the next step when you removed the rust.
When you're done with sandpaper grain 100, go continue with sandpaper grain 350. After sandpaper grain 350 you start to use a waterproof sandpaper around grain 800 to 1000. (You could use water to get a nicer result.)
Take a lighter/gasburner when you're ready to bring back the welds.
Wait at your startpoint until the metal becomes blue/brown, then move slowly. (For smaller welds move faster.)
!!Do not stop in the middle of a weld. When your weld is failed use sandpaper to remove it.!!
At the end you have to protect your exhaust, spray around 5 thin layers clearcoat on your exhaust.
For the best protection you should use two-stroke oil.
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Good luck!