Removing dog pee stains from stair treads

Q imported from our old site, Face Lift Floors: After deciding to go with bare hardwood stair treads, we removed the carpeting only to find that a number of the stair treads have been urine stain-damaged by dogs. The slats on each stair are not random length and therefore we cannot simply remove a chunk to repair it.

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Do I just router the bullnose?

Q imported from our old site, Face Lift Floors: I am replacing my stair treads with oak ‘slabs’ and want to know how to address the ends of the treads that are exposed (open staircase). Do I just router the bullnose along the “grain end” of the board, or should I miter in a piece whereby the grain runs along the open edge and then bullnose with the grain?

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