Dark brown spot on my floor where cat peed

Q: I have a wood floor in our living room. We have an older Siamese cat that has accidents every now and then. I found a spot this morning on the floor where she had just peed, and now there is a dark brown spot on my floor. Any suggestions on what I can do to lighten this spot?

A: Try some fine steel wool if it is a wax finish. A polyurethane cleaner if not.