Hi Kathrina,

Most bad smells from tub/showers and lavatories come from rotting hair matted in with grease in the drain lines. Try this for the smell. Tonight before bedtine Take a 1/2 gallon of bleach and pour down the drain and let set over night. Next morning ,(and this is important) flust out esch drain with two large pans of boiling water to loosen the grease and flush the mess out. Let me know how it worked. Tom

Hi speedball, do you pour the bleach down the overflow and the drain?

Just pour down the drain and let set overnight. Next morning ,(and this is important) flust out esch drain with two large pans of boiling water to loosen the grease and flush the mess out
Good luck, Tom