Lego safe air freshener options

I've got a new work office that also serves as our meeting place for my team of 10. It needs an air freshener but work normally does the auto spray ones; I explained to my boss that those ruin LEGO... she said well that's out your Lego stays but can you find an option that works.

For obvious reasons incense is out (fire bad), can someone please help point me towards Lego safe options?