CLEAN the GEETAR before you put it in the case, if it's been soaking up 2nd hand smoke. Just wipe her down. Won't get the innards but better than letting the finish soak that stuff in.

VACUUM the case innards, wipe off the case outards. Calgon in water will cut through built up smoke oils on vinyl, chipboard. etc. NOT ON THE GEETAR.

And THEN use the other stuff that's being suggested.

And... see about an ionizer air purifier. That's what takes the smoke stink out after a housefire. Open the case and let it run-- minus geetar. Run a fan too to circulate the air.

If it's really a problem I'd keep a second clean case around the house for in-house storage, and just use the stinky one to go gigging.

And quit having sex (alone or with others) in or on the case!

The rest is "patina."

~Susan