I just figured out something today. My whitening shampoos have not been doing their usual stellar performance at my new location. It took me a while but I now know that it must be the well water. I have well water on my farm and have to use a clarifying shampoo on my own hair fromtime to time to reduce the brassiness in color.
I am not sure on how to get the whitening shampoos to perform better but I will call the manufacturer and see what the advise. Stay tuned.