Landlord question regarding cigarette smell

[Michelle Fox]

We have a new tenant about to move into one of our rental homes. The previous tenant violated the lease and smoked in the basement. The new tenant says she smells smoke throughout the house. We have washed down every wall, ceiling and hardwood floors. We do not smell any smoke. Looking for suggestions as to how to handle this situation. The tenant just picked up keys and moving in next week. 

[Jennifer Z.]

@Michelle Fox 

Get an ozone generator- under $100. I bought one for $80 on Amazon. Just plug it in, let it run for a day in a vacant unit and you will not smell it again. It's a miracle worker!