Smoke smell/ House cleaning tips

[Jordan Whitworth]

I purchased my first duplex and one of the sides had a previous tenant who smoked in the house. I've been working to get the smell completely gone and I am pretty close. I've cleaned the walls with recommended cleaner and had the air ducts and furnace cleaned of any tobacco resin. The house smells 10x times better is livable at the current smell. But there seems to be a tiny smell (kind of smokey but no where near the level it was). The smoke smell use to stick to clothes if you would work in the house for too long. Now that doesn't happen. 

I'm wondering if anyone has an recommendations to get the smell of the house back to a normal state. Maybe i've missed a few spots? Maybe a full cleaning of the walls and house again is necessary? 

Thanks!