I had a bottle of PUREX leak on my beige carpet leaving a round blue stain. I have worked on it with various products, but still have a round darker area on the carpet.
Answer: Sounds like you need a good carpet cleaning! In order to get the Purex out of the carpet, I recommend trying plain hot water in the BISSELL Carpet Cleaner, and keep rinsing until no more suds come out.
If there is any discoloration remaining, follow up with OxyPro® Stain Remover for Carpet – and let it stay on the stain overnight.