But don't worry. Stainless can be brought back from the brink of dissaster when you have a bufing wheel and the right compounds.
Here's a demonstration on the worst spot of the pipe, so you can see the progress.
Buffing is a two stage process. First there is the cutting stage. In the cutting stage you use a very coarse compound on a wheel that actually removes the top layer of material like a sanding wheel, leaving a nice brushed surface below.
Then comes the 'coloring' phase. For this you switch to a soft cotton wheel with a
very fine compound that really brings the shine out.
Can you see my reflection in the pipe.....? Well, don't stop there. Keep on going and you end up with this: