I don't see it discussed in the ME/CFS community much, but there is a law in California that requires huge amounts of flame retardant chemicals to be added to most furniture items around your house including your pillows, couches, carpet, curtains, etc.
Since it is a law in California...
I recently noticed a urine type smell in my bathroom in my new home.
I narrowed it down to the toilet.
So I pulled it scraped off the old wax ring and put on a new one.
Still had the same smell so I removed the toilet again and I put a flat