I agree with you about cats carrying smell around, although some people will make it out to be worse than it actually is, but the estate agent who did the check-out for this property told me over the phone that the upstairs carpets were fine and that the smell was downstairs. BTW the ENTIRE downstairs is solid flooring, no carpets. I reckon the smell was coming from a patch of bare concrete near the litter trays that had absorbed some of the smell.
This is where I have the issue. If it was fine upstairs, why do it anyway? If it wasn't fine why the hell tell me it was? They told me it was