I start with a thorough vacuuming and cleaning.
I do use a professional because I don't want my vacuum to be full of the spell and source of odor.

Here is my story of how I discovered the most incredible odor remover that works by breaking the chemical & molecular bonds of odor.

I moved into a house that had all wood floors
EXCEPT for the kitchen. While moving in the neighbors cat crawled in a window and sprayed the carpet in the kitchen and down a heat vent. It was extremely hot and humid....as only the Dakotas can do. Carpet cleaners could not come for 3 days and we were literally sick by the odor.

I purchased spray bottle of Natural Magic Odor Blaster. NON SCENTED as the citrus scented did not work as well. I sprayed the area and down the vent. (I've been told cats have figured out if they spray a vent their scent will fill the house...not that they understand it....but they understand it will work) Anyway, I sprayed it and the smell vanished!! Completely!!! Immediately!!! 3 days later the carpet cleaners came, cleaned, and there was a remnant of the smell. I sprayed it again and never smelled the source. I use it in the laundrey, with old fishing stuff etc. If I could I would buy stock in the company. It can be difficult to find.
I've found it in small hardware stores...not the big ones. But I believe it is on line and you could get your store to order it. Don't use the citrus. I have a couch from the sixties that has a tone on tone Egyptian scene taken from a tomb painting. It smelled awful when I purchased it before they knocked down the abandoned house. I used the above procedure and everything is fine. I have a minor in Egyptology and just could not resist this couch.

Hope this helps. OH!!!! If a child wets the bed, you can use salt to lift the liquid or blot with pampers etc. Then pour hydrogen peroxide liberally. It didn't change the color of my mattress (it could yours) but completely broke down the urine by oxidization.

Jan