I took a large shampoo bottle and tried for weeks to get the smell out of it. I boiled it over and over and put rubbing alcohol and never could get the smell of shampoo out it. (I was like on a mission) I gave up and just put a bottle of old #07 in my suitcase and got caught. They were nice about it and returned it to me the last night and so I did get to drink it that night. Vodka drinkers will have better luck with the water bottles, but us wiskey people could have problems.