This seems like a good thread to interject this question- I'm not trying to sidetrack the thread but am wondering if formaldehyde in carpeting might be the thing.....
We built a new house and after moving in, we noticed a SMELL that was really awful in the master bath and closet, the other bath, and the laundry room. It smells (well-smelled) a lot like male cat/tomcat urine! It was so awful I wanted to cry, no amount of cleaning or soaking cleaning products in the toilets would take away the smell and I started to have a fit, thinking that the neighbor's tomcat must have gotten in an open door or window during construction and sprayed some walls!
We finally determined that the smell seemed to be our *water*, so I called the water department to get them to flush the line and see about getting our water analyzed. It was simply horrible just after showering and seemed to center around the toilets and washing machine otherwise.
Are you with me so far? Well, this thinking (that it was our water) didn't explain why our CLOSET smelled so strongly after a shower, too. The water department actually asked us if we had a new house, or had new carpet put in recently. They said NEW carpet, especially berber (which ours is NOT berber, but IS new) puts out "a chemical" that stays in the air and reacts with the chemicals in the water, that had recently been extra treated for a month.
They described the resulting odor as a pee smell!
I have no idea if this is true. My husband put a good filtration system on the whole house and this helped, but we still have problem areas right at the toilets and washing machine- the house no longer reeks when we use the shower though. Can this be the formaldehyde in carpet? if so, I can see why someone would be looking for carpet that does not contain this!
We're putting hardwoods down ASAP..