Tea cup with stains in side sitting on brown rug

So many of my mugs and tea cups are stained with coffee and tea, which is just unsightly. No matter how hard I scrub, the stain won’t go away.

Earl Grey tea is one of the worst offenders, the stains just won’t budge.

What I need is eggshells, apparently! 

Get an eggshell and grind it up, place it in the stained cup or my and add warm water to cover the stain.

Let the concoction sit overnight, the eggshells should absorb the stain.

Rinse the shells away and if any staining is still visible smear on some Rose or Peppermint Cleaning Paste and rub with a damp cloth, wash as usual.