Furnace air still smells like cigarettes after filter change & duct cleaning

Hey guys.

My wife and I recently bought a home that the previous owner smoked in. I've removed a lot of the odour with intense scrubbing, shellac based primer on all the walls and fresh sealant on the hardwood but... Whenever the furnace runs the air carries the smell. I had a duct cleaning done and changed the filter.

Is there anything else I can do to clean the tar/ nicotine from my furnace or my ducts?

I also had ozone guys come in and do their thing too.

submitted by /u/pogueboy
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