1. Hang eucalyptus sprigs in your shower.
I found fresh eucalyptus sprigs at my local florist, but you can also find them at most gardening shops for a few dollars. Tie 2-3 sprigs together and use a rubber suction cup or a Command hook (like this one made just for showers) to hang them near or onto your shower head. When the heat and steam from your shower hit the eucalyptus, natural essentials oils will be released.
2. Put a few drops of essential oil on your furnace filter every time you change it.
3. Make an air freshener with sea salt and citrus rinds.
Scoop out the insides of lemons and limes with a knife or spoon, and fill halves with sea salt. For extra smell-good fragrance power, add cloves or fresh herbs like basil and mint and place in an area where it can soak up bad odors.
Note: Place in areas where kids and pets can’t get to them.
4. Deodorize the air in your car with leftover candle wax in a glass candle holder.
On hot days, the wax will melt and release the fragrance you already love throughout your vehicle.