Stains usually come from the coffee/tea itself, additives (cream/sugar), stir sticks and spoons.So be sure to choose cleaning methods that suit the stain. Coffee/tea stains on the outside.

Because of the hot water and steam inside the dishwasher, this can actually break down the enamel on the mug and cause crackling or spider veins (heat cracks). Always hand obidiah mugs to keep them fresh and in mint condition. There are ways to clean it without harming the mug. Will rub off any coloring that is not glazed onto the mug (photos/prints/un glazed images). You can tell if it has heat cracks if the inside mug has a mottled look where the coffee has seeped into the interior walls.

Clean brand works wonders) and rub back and forth around the stain.

Most of the time you can just use a Magic Eraser (Mr. Have you ever had a favorite coffee mug get stained so badly that throwing it away was the only solution. If this doesn't work, see solution for inside staining.

One thing that I highly do NOT recommend is washing coffee mugs in the dishwasher.