Have a client who tried cleaning a rayon rug wine spill. She turned baking soda into a paste and covered the spill with it after blotting. Turned the spot dark brown. I came over the next day and imedieadtly realized it may have been a viscose rug and applied a little Chemspec browning treatment on a small part of it. it only slightly improved it. Bonnettpros oxyspotter did better and I applied it to the rest and then rinsed and it looked 85% better. Towel dried the heck outta it. Looked great when I left. Rug was too big and had a ton of furniture on it so I could let it dry face down. Well it yellowed a lot more and I'm going back tomorrow. I'm pessimistic about my chances. Any have any luck?