How to clean tea and coffee stains from cups

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okay, okay, I know it is not the same mug but I forgot to the a before picture of the one I cleaned. BUT the one I cleaned was much worst than the one I took the picture of. 

I simply used some salt and baking soda and scrubbed the shit out of the cup. literally! And look how pretty and clean it is now. Now you know what to do! You're welcome! ;)