Cleaning tea stains in cups

Baking soda or salt on a soft cloth cleans tea stains
Metal scrubbing pad scratches and makes staining worse on cups

What you need are sponge erasers. Just damp them and they will remove the tea stains a treat. They also have may other uses and are cheap to buy. I got mine in Poundland.

Soda crystals. Put a small spoonful in the cup and fill with boiling water. Soak until you next do some washing up.

Denture tablets are supposed to do the trick, i think.

Just diluted bleach. We have dishwasher so don’t tend to get stained cups.

I use bleach but make sure you rinse well afterwards or your innards will suffer !