The Prime webpage says that the product is a mixture of hydrosulfite salts. It's the sulfur in the product that makes it smell bad. Fortunately, the stuff is very water soluble. I would treat this like a pet urine stain. I'd suggest wetting the area with cold water and blotting dry with a towel. Do that a couple of times and then try a cleaning product like Febreze or Carpet Fresh to neutralize the odor. HTH