I've heard from different people that you're supposed to pour either bleach or vinegar into the AC condensate line once a month to prevent backups.

You can fill bowls with vinegar or activated charcoal and place them in closed off rooms.

If they've been smoking in it for years this might not work but I mixed a solution of vinegar and warm water and wiped down about every square inch of walls and windows in a rental where it smelled very bad of smoke.

I have used a mixture of vinegar cleaner to clean the carpet and get pet smells out and it may work for smoke smells as well.

Either a water and vinegar solution or you can use a product called Nature's Miracle which can kill urine odor.

You will catch more flies if you use honey instead of vinegar.

It is a good deal considering the low level of risk, so I guess it goes along with the saying, "you can catch more flies with honey than vinegar."

It can penetrate into electrical outlets and cabinet crevices.We start with a white vinegar/water wash of every surface.

You catch more bees with honey, than vinegar. 

But before doing so, really clean the tiles and tub with baking soda and vinegar.