It is super frustrating when coffee (or tea for that matter) leave stains inside mugs. Sometimes you are lucky and you can wipe it off or it comes off in the wash. Other times it has sat too long and you are stuck with this beauty (see above) and your mug no longer looks clean. Luckily, my mom taught me an old school trick of getting rid of these stains, that works every time.
Getting rid of coffee stains (and tea for that matter)
Wet the mug inside a little.
Rub salt on the stains and you will magically see them disappear.
Wash the mug, and voila, no more stains.
This is such a simple and easy trick using one ingredient that everyone has on hand.