Lemon oil works to absorb the smell - don't put it on the beasts, put them in a cupboard with a saucer in which a little lemon oil has been spilt. To mask the smell, spill a little peppermint oil into a saucer and apply similarly, but after the lemon oil treatment (or for the car interior). Lemon oil can be used to polish the guitars, or to stop strings squeaking, but that will absorb the malodorous components onto the guitars ( to remove, use copious amounts of the lemon oil!).