Here’s a piece of Barn Door investigative journalism. I’ve been using a very sticky mixture of kool-aid and Perpetuem in my water bottles, that along with mountain biking is leaving them very dirty and sticky. Will a washing machine get them clean with little effort? If you’re wondering why I don’t just use the dishwasher its because we don’t have one.
I can report that my bottles came out clean and smelling bleachy fresh. Due to the amount of energy it takes to wash bottles like this its probably only efficient if you have a pretty big collection of dirty bottles.