We have that problem a lot.Our neighbors cat sprays our back door.And if we open the INSIDE door it stinks.And if you come in through the back door you can't smell it until you open the screen door.Then people will probably think it's our house unless they come in all the way
We scrub it a lot.With whatever we have.But the cat still sprays every so often.Not as often as before thank goodness.I'll try the things people suggested on this thread also.Thanks