I worked on a house occupied by heavy smokers for a couple decades (then they died). Nicotine yellow everything. We pumped it full of ozone. That did a good j

I worked on a house occupied by heavy smokers for a couple decades (then they died). Nicotine yellow everything. We pumped it full of ozone. That did a good job destinking. Then we painted everything with killz. We also sterilized the basement with uv deathlights.