I think dishwasher detergent may be to blame for some of the staining inside the cup or mug. They are often quite abrasive and can damage the surface glaze. We always make tea in a pot but our mugs are slowly becoming stained. It's pale but you can see it.
I'm Sure It's a Repeat of the Summer of 1976


Wot no Tea? who didn't put it on the list when they'd used the last packet then? Not me! It was 'im indoors 

