I always first try bicarb & vinegar, when that doesn’t work I often have success with a bit of Nappisan and boiled water and I always have Steradent at home for dirty pots, pans, cup and glasses as another option.
Make a paste of bicarbonate soda and water, apply to stains, leave for a while. Add a small amount of white vinegar to the glasses and top up,with hot water. Leave to soak
I guess this would be like a coffee stain in a coffee mug.. I agree bi carb soda mixed with water and let it sit overnight.. the wash out cup/ or mug.. If that doesnt work the only other thing i can think of is to fill the cup with white king and leave sit for a hour or so.. But keep well out of reach of children. And wash a few times in hot bubbly water.. before use..
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