Radon!!! Now why didn't i think of that??? Ha ha! Or it might be the increase in silvery minnows and spotted owls!

I do remember as a kid hearing my folks talk about some salt or ash present in our water which made all the standard spot removers (CLR and the like) ineffective... Then again, I did grow up in LA so I do glow at night...

(Lots of New Mexico humor here...)