->If you want to clean out old amber bottles and reuse them, here's what to do:
First, wash the bottles, droppers and caps with hot soapy water. Add in some vinegar to help get them really clean. If the bottles have oil, squirt in pure dish soap, a bit of water, and use a small bottle brush OR pipe cleaner (sold in craft and dollar stores) to scrub out the oil. You'll have to do this several times, and washing the brush/pipe cleaner with dish soap will also help. You might even want to use more than 1 pipe cleaner.
Let the caps soak in the water while you sterilize the bottles and droppers. See How To Here.
Rinse the caps well with water, then let them dry on cookie sheets with the bottles and droppers on the lowest temperature setting of your oven. Once dried, your bottles are now ready to use!
->If your bottles are made with plastic, here's what to do:
If your bottles are made with plastic, then once you've removed the oils using the brush/pipe cleaner and dish soap method, simply soak them for several hours in very hot soapy water + vinegar. Use 1/3rd to 1/2 part white vinegar + 2/3rd to 1/2 part water. Alternatively, you could pour pure white vinegar in each bottle OR hydrogen peroxide (1 part food grade hydrogen peroxide to 11 parts water, as directed on the bottle). Let sit for several hours, then rinse well. You could then let them air dry or use the cookie sheet method on the lowest oven setting.
NB. If you have small plastic pots, like small travel lip balm pots that had some kind of beeswax or candelilia wax in them, first wipe out any excess with paper towels or old rags (including the lids), then follow the above cleaning method of using dish soap, vinegar, etc. above.
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