Where people fail is the first thing they do. They should absorb the urine as much as possible but you can bet the first thing they do is spray a load of something on top of it.
Jay cloths are good, kitchen paper is much better but you can use a whole roll on one accident so not the most practical. Toilet roll is good obviously but leaves bits everywhere.
Tell them they should blot it up until NO MORE transfer onto the cloth/paper. Only then should they put any products on it. I would suggest a mild solution of biological washing detergent, which itself is then blotted out. The white vinegar will help reduce browning on wool.
I'd advise that as a first aid measure and then get you out to extract it.