It works.
If you are unsure, do something like take a stinky but easy to sanitize thing and give it a sniff beforehand. I used an old pair of reading glasses that I wear all the time and always forget to wash the ear loops. Gave both a sniff, both had a lovely odor to them, gave one side a wanding for 15s, the other nothing. Double re-sniff and the wanded side was scentless while the other side still had a bit of behind the ear odor.
Great product!