Had some old juice that I dumped and was looking for a way to clean out the bottles. So, I thought, heck, baking soda keeps my frig smelling nice and clean, let's soak the empty bottles in a mix of about 2 tablespoons to a pint of water and soak the bottles. I let it sit overnight and there is now no smell at all inside the bottles. However, the labels did peel off, but left a sticky film on the bottles. So, I tried a little bit of Tea Tree Oil on a paper towel and rubbed the outside of the bottles with it and it took the sticky film right off the bottles with no struggle at all! I just washed the outside of the bottles with a little Dawn dish detergent and hot water. Got myself 6 almost brand new bottles to reuse 
