I think you'd be ok as long as it says on the package, "This product or service is not intended to diagnose, treat, or cure any illness or disease whatsoever, and is not intended to substitute or subscede for any traditional allopathic madical care, and said product or service futhermore and forthwith shall not be held liable under any circumstances, real or imagined, for any injury or illness sustained or occurring from improper use of said substance or procedure found herein or hereupon forever and amen."
Or maybe just, "Not for human consumption. Alien use only."
But whatever you do - don't write on it, "Warning! Danger! Caustic! Do not inhale or spill contents! Contents may cause drain bramage if used improperly!" Oh, wait, that's the warning on deodorant.