How to remove stains from tea cups

Pretty often tea and coffee leave ''stubborn'' brown stains on the cups. They just don't want to wash off! There is a cheap and quick way to remove them - use baking soda. Put 1/2 teaspoon of baking soda in a cup and clean it with a damp sponge or rag. 

Here is my cup before cleaning

And this is the magic of baking soda

Enjoy your cup of tea and have a nice day:-)