We have all done
it, we discover a baby bottle under the couch or forget our
travel mug with half a latte in it in the cover over a hot
weekend. And the smell of sour milk can be hard to get out
of the bottle or mug. But here is how to do it!
Get a large plastic
bowl or bucket, large enough that will allow you to submerge
the mug/bottle (and lid!). Add 1-2 tablespoons of baking soda,
then add enough hot water to fully cover the bottle. If needed,
place sometime heavy on top to keep it submurged. Allow the
bottle/mug to sit for 12-24 hours (the longer, the better!)
Remove, rinse then wash in dishwasher or handwash with hot
soapy water as normal.