A good friend that has techs working for him ran into a problem. I have not personally seen it, but received his description. It is an area next to an intake vent. Urine from pets. Technician misdiagnosed carpet and did not realize it was wool. Used Matrix urine treatment that has peroxide and is 10 ph. Rinsed (one earth). Carpet got brown/yellowish (not a jute backing! so it ain't celulosic browning. Again I have not been there.) Stain Magic- for wool Later they tried Chemspec browning treatment and followed with acid rinse. So now the wool has been exposed to peroxide, 10 PH, strong acid and an acid rinse. As of now it may be salvage or replacement. He could not tell me if the browning was just at tips of fiber or all the way down. At this stage I am not sure how much of a chemical load of different chemicals are there. I was wondering if. Rinse to remove chemicals. A mild reducing agent may help. With buffing. And if yes, which one. The acid residue may boost it so it may need to be rinsed. or: Buffing with an encap with a mild peroxide. Any ideas?