By Lauren Haughey There’s nothing that ruins a cup of tea quite like a kettle plagued with limescale. Albeit tasteless, the chalky substance forms a layer of scum on the top of beverages that isn’t exactly pleasant. But don’t worry, cleaning gurus may just have you covered with a quick trick that involves something you might find in the kitchen cupboard. You may be surprised to know the magic item is simply citric acid – the compound derived from lemons that’s often used in the likes of lemon cake and even lemonade. According to The Express, this was recommended by the Mrs Hinch Cleaning Tips …