... back the natural chrome look like color? It seems like there's a golden residue formed on them, and I can't get rid of it with wash.

The tech article works with the original exhaust pipes, so that' snot too much of a help, or ....

I have seen it on line at some of the car care sites , but in the Chicago area it is sold at most hardware stores.
This is the Ph. # from the box.
708 - 246 - 8581
If you Still can`t find it post here and I will see what else I can do.
Good Luck.