Ahhh, yes, that wonderful smell! There was a great thread a couple of months ago about it . . . try searching?
I exorcised the demon from my Hanson-Roberts by putting the cards in a takeaway container with a good half a cup of bicarb soda and shaking well. I left it for a week, changed the soda, did it again, then changed the soda again, this time adding two drops of essential oil. Then I shook it well, put the lid on and put the container out in the sun, to warm it up. Then when it was warm, I took the lid off and let it air out overnight.
There's still a trace of smell, but it's bearable. I remember all too well that horrid stench!
Good luck!
\m/ Kat