I'm using essential oils
Vanilla Scent-
A Friend gave me for Christmas and love it, but the refills are very pricey.said too myself there's got to be away to reuse these! So I popped off the end and filled it with Vanilla Scent oil, popped the the filter back in and WOW it worked. 
No more buying the refills....I can make my own at home and change the scents for the different seasons.
Love recycling..
Love recycling..