How To Get Rid of Smelly Drains | Ask A Plumber 

Sometimes outside I'd get a hint of sewer gas. Recently I can smell it from the wall in between the bathroom and kitchen. Sometimes it's stronger than other times. The thing is I don't get the smell from any of the sinks themselves, toilet, nor bathtub. The closest drains to the wall are the bathroom and kitchen sinks. I get the scent through a pinhole on the wall as well as the light switch in the bathroom. I realized outside the washing machine drainage was set to a new pipe. So the old one is just there cut open. I think that would explain the hint of sewer gas on the outside if that ptrap has dried out. I don't want to cover/seal it or pour water inside it because i don't want the scent on the wall to increase if it is related to that. If its no longer coming out through that cut open pipe the only way out would be the wall inside the house??? Would pouring one of those enzyme drain cleaners on the roof vent make it worse if that up there is clogged?

Hiw about when it rains I smell oder when it rains outside but I don't when it's not

New house and I have an issue with slime build up (and the related odor) in the tailpiece of the bathroom sinks, and a stinky garbage disposal. I'm thinking it's the fault of the ultra low-flow faucets not effectively flushing out the pipes (this is in California) .

Can you suggest an enzyme cleaner