 Heading to Arizona with Yvonne on the line who's got a stinky bathroom sink. Gross, Yvonne, what's going on? Yeah, so it doesn't happen all the time, but every once in a while I'll be running the water in the bathroom sink and this foul odor comes out of the drain. So I'm wondering what could be causing that. Usually it's bacteria. You get the bacteria that will decay in those drains and it will cause what's called a biogas leak.