I wonder if bicarbonate of soda or even soda crystals would work? I use in teapots and it makes the tea stains lift off easily. I too have heard of the vinegar tip.
Aah! I could definitely stamp and shout at the moment!
Do you feel no-one listens ro you?


) and have seen Milton tablets work well too. Am sure soda crystals would be good too but perhaps more caustic?