Hi Pamela, what kind of air freshener are you trying to save? Is it a solid or an aerosol can?
Most types of air fresheners work by evaporating. Seal it in a zip lock bag.
Hi Pamela: I agree with Ken. Keep it in a zip lock bag, preferably the freezer type as it is thicker. Good luck
Add drops of essential oil which matches the scent you have.
Do you mean the hanging down ones in cars, or the cone kind that evaporate, or plug in's?
Aerosol cans do not evaporate. Why are you trying to save air fresheners?