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If you make your own skin or hair products, re-bottle products, or refill bottles from large (gallon/liter) containers, chances are your bottles will, at some time, become contaminated. You may never notice. For at-home decontamination, you can wash bottles with hot, soapy water and run the liquid through their caps if you have a flip-cap. Then use a bleach solution, isopropyl (rubbing) alcohol, or vinegar to kill bacteria by pouring some in the bottle, shaking it vigorously now and then over the course of about 20 minutes. Run that through the cap too. For a final rinse, use water you have boiled and cooled (cool enough so it won't melt the bottle), and rinse several times. Air dry. ©Science-y Hair Blog 2013 Plaque: a bacterial biofilm But there's a sneaky little trick some bacteria have to stick to the bottle, presenting a possible source of contamination for your product. It's the same trick bacteria use to stick to your teeth, creating plaque: BIOFILMS. ©Science-y Hair ...