Toddler has a cough which, the other morning, made her vomit a small amount of her morning milk. I say the other morning because DP can't remember when - I was away for a few days and am guessing Saturday.
Anyway - he had a go at cleaning it with a damp cloth but there is currently a white stain, about 4cm in diameter, right in the middle of the room. The stain is dry but stinks of sour milk. Carpet is a speckled dark grey loop carpet and it's wool.
I have no idea where to start, other than 'buy a rug'. I have already made some remarks about not cleaning it properly to start with but this didn't actually make the stain go away. Help.