Could this hurt me?

Your mouth probably retains more mouthwash than your bottle did, don't worry, just rinse it well to try to remove the taste. If put in a dishwasher I would be concerned about the heater element damaging the bottle during the dry cycle, only put it through the dishwasher if the maker says it is dishwasher safe. (Contigo bottles aren't).

Wash it with soap and water--don't use MOUTHWASH! Yes, sometimes mouthwash has alcohol or peroxide in it--but it's not meant for human consumption--you don't drink it when you use it, so you shouldn't wash dishes with it. Wash your bottle in hot soapy water, then if it still smells like sour milk, fill the bottle with hot water and add a couple tablespoons of chlorine bleach--then let it sit for an hour or two. Then dump out the water and soap and bleach, and rinse it for five minutes with plain water.

Rinse again, but yeah, all the alcohol in mouthwash probably did good. Actually, I would have just used hot water and soap...........

wash it by warm water,then put it under sunlight for few hours,no smell or germs will be found :)

(dont forget to give a like :p)

All that is so much overkill I cannot believe it! All it needed was washing in hot water.

I think you will be ok to rinse it a few more times.

Eww! Could make you quite sick. Bad milk? And mouthwash is meant to be spit out, not drunk. Could lead to being fairly sick. Yuck!

☺