This is my short and frugal tip of the day.
Have an “empty” essential oil bottle?
Open the bottle all the way, including taking off the stopper and put it in a ceramic up.
Boil some water. Once it is boiling, pour the water in the cup. Make sure the bottle fills. Do just enough to cover the bottle.
Now place it in a room and it will diffuse the left over oil and you will still get the benefit from it.
When the water cools, I add it to my ultrasonic diffuser and continue to use it.
Now the bottle is clean and ready for the recycle. Plus, you didn’t waste a drop! YAY!
Reclaimed Mama 
I put baking soda in an air-tight sealing jar or other container, then dump all the lids, reducers and their bottles in as I empty them. I give the container a good shake and then let it sit. As I add more bottles/tops, all the different oils get infused into the baking soda. After a few weeks or months, I strain out and brush off all the bits and put the soda into a repurposed cheese shaker container and use the fragrant soda on my carpets. The bottles get washed and reused for oil samples or gifts.
That is a fantastic idea. I would of never thought of that.
Wow! Great idea!
brilliant!
Put the empties in some Epson salts. Later you can use the scented salts in a foot soak.
Any suggestions for getting crystallized cinnamon oil off the bottle and dropper?
Have you tried hot (boiling) water?
Such good ideas. I will certainly be following them.
What do you use the emptied bottles for after all the yumminess has been removed?
At this point, I recycle them but I’ve seen great projects with them. I saw someone make a string of lights using old Christmas lights and empty eo bottles.
You recycle them and put “what” in them? More oil?
I buy oils in larger quantities then refill the 5 ml empty bottles and make new labels for them. That way I can use my smaller bottles for traveling. It’s also much cheaper.
Great idea, but I wonder about the plastic parts being melted into the hot water, and the ink from the label.
The water isn’t hot enough. It is probably only 180 degrees once it is poured.
Brilliant. Going to try this!
I was thinking that I would relabel and use them for blends that I find effective!
I save them and put maybe 20 drops of the oil it’s labeled for and share it with others who are interested in trying it.
Also, the ingestible oils or oils blend, I sometimes put in the hot water with my green tea bag and have a oily tea!
Great ideas from all of you. Thanks for the suggestions. I really like the epson salt and baking soda ideas.