As the other poster indicated, if you can find out what caused the
stain, the better off you will be in selecting a "bleaching" mechanism. What
I have found to be dam near impossible to fix is urine stains from a cat.
Not sure why, but this seems to be the toughest staining problem to fix. I
gave up and replaced those boards in my house. Previous owner I guess was
not too clever at taking care of thier animals. When you do select something
keep in mind most of these stains are not a fixed darkness. You will have to
be careful not to "overbleach" a area. That will stick out just as bad. I
would use any solution in a diluted state and try repeated treatments rather
that one heavy treatment. This way you can adjust the approach based on the
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