Yes, we had to do every surface of the entire house, including other cupboards and enclosed areas, this is the one remaining spot.
Sounds like you have few options left other than actually ripping all the affected surfaces physically out. Plaster off back to brick, chop out any affected timber, basically anything that the old fag smoke would have come into contact with.
@ectoplasmosis started
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Yes, we had to do every surface of the entire house, including other cupboards and enclosed areas, this is the one remaining spot.