We have had a problem for several months with our cat urinating, in the same
place on our carpet.  (No bladder or other problems reported by the vet.)  A
neighbor of mine had a similar problem (can't get the smell out).  She had
replaced the carpet 2 times and  still had the problem with the smell (the
urine and gone down through the carpet and padding and had soaked into the
floor.)

Her remedy was to pull up that portion of the carpet and paint the floor
(plywood, not hardwood) with any kind of indoor wall paint.  The urine would
seep up and bead on top of the paint.  She told me the paint draws the urine
out of the wood.  She had to repeat this a few times, but finally the urine
was removed and she no longer had the smell.  (There was a paint smell for
awhile, but that goes away.)

Has anyone heard of this?  Isn't there an easier method to remove the stain
and the odor?  I don't want to have to rip up the carpet, if I don't have
to.  I have tried, those oxy cleaners, the odor remover shampoo for The Rug
Doctor and several other ideas.  After the carpet dries completely, she
smell returns.  I really want to solve this before the weather changes and I
have to close all the windows!

Help would be appreciated.