Call today from someone moving into a new flat. She said there was a black area in the corner of a room that she tried to remove with milk

Why milk I asked.
Someone told her it would get the stain out.

Well it got the stain out apparently.
What about the smell you'll be left with when the milk goes off I asked.
"Didn't think about it at the time and thats why I ringing you now, it stinks" :

Havn't seen it yet but what will be best to treat it with, enzyme digester & plenty of deodoriser & sanistiser?
Thanks
Paul