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Probably when you no longer smell that "new car smell" although they do persist a little longer than that below detection.
" They do break down quickly, to the tune of about 20 percent decay every week,"
to speed it up leave car windows open and park in the sunlight
from What Causes 'New Car Smell'?
Oh boy I hope your new car stink goes soon, my sons car is 12 years old and I can still smell that new car smell in his car. I think it stays in some cars better than others.