She needs to also have the hvac cleaned and treated with antimicrobial / antibacterial cleaner. (duct cleaning) and replace all the filters. Don't forget to have all clothes cleaned and, in the future, the smokers clothes remain outside or in a separate closet. And, he/she needs to shower immediately after entering house.
Have a pro clean your ducts. They have the tools as well as the needed pro level chemicals to do the job. Insurance may cover it then. Check out all light sockets and the insulation of your attic as well.
Our health immediately improved after the new house was thoroughly cleaned.. including that of our dogs and cat.
You need to get into the venting systems. They make a variety of fumigating bombs that do the trick. I prefer the cheap one in Walmart auto supply. Follow directions.
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https://www.wikihow.com/Get-Smoke-Smell-out-of-Your-House
I would use Hot Shot Fogger air neutralizer. It is the only thing that will get into all the places you cannot repaint or wash.
Replace carpet, curtains or anything upholstered, repaint walls.It's hard to remove all smoke.Put up big signs "no smoking".
You need to get into the venting systems. They make a variety of fumigating bombs that do the trick. I prefer the cheap one in Walmart auto supply. Follow directions.