If you had to have it cleaned three times in two weeks, I'd say that the
cat piss smell is never going to come out.
Remove and discard all carpeting and padding , then give the whole floor
six months to air out.
When I bought my fixer-upper house in 1979, after I removed the stinking
carpeting and pads. I decided to just let it air out.
I mopped it once a week with some kind of enzyme that was supposed to
break down the urine smell. I don't know if it did any good or not but
eventually the smell went away.
Though I did not think to use polyurethane, I wonder if the odor would
just have come out the bottom?
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