I did not think a convertible would keep the smoke smell as much as other cars that are closed in and specially cloth seats, leather and synthetic carpet does not seem to keep smoke smell that much, what does is the air conditioning system, if the previous owner smoked in the car a lot with the top closed and the ac blowing that will stay, I think you can clean the ac internals (blower, flapper, vents, clean air filter, evap) with steam
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