Dawn dish soap cuts through just about ever oil imaginable........if possible let it soak a bit give it a couple good shakes and rinse with warm/hot water....
Polident or Efferdent (for false teeth) tablets work great. And work especially well on narrow necked bottles/vases that you can't stick a brush down inside in order to clean. Just fill the bottle with water and add the tablet and let it sit. It will do all the work!
Try rubbing alcohol. That's what is used to clean aromatherapy bottles when empty. We also use pine sol to cut the oil (and bubbles!) in the bathtub after essential oils have been used.
Login using the form on the top of the page to post feedback (if you are a registered user). If you have not yet registered, click here to do so. It's FREE!.