AC drain tube clogged, water soaked my carpets & carpet is severely stained. on 2006 Lexus IS250

I recently took my car into the dealership because my AC drain tube was clogged and water was leaking. The water was soaking the carpet on the floor, especially the floor in the back seats. The tube was unclogged, the water was vacuumed up, and I also had a detailing of the car done. When I got my car back the carpet on the floor in the back is SEVERELY stained. Is this normal? Is there anything I can do to resolve this?

Asked by for the 2006 Lexus IS250