A friend gave me one of those amazing clear jugs with the pretty blue lights for Christmas after I coveted hers during a coffee and a chat last year. I love that I can see how boiled the water is and how many litres my husband is putting in there for his single cup of coffee and I really, really love the blue lights despite them not adding anything to the boiling of the water! But being a clear glass jug, I could see the dark build up on the base of the jug that is conveniently hidden from casual sight in a metal or plastic jug. I opened the top a few times and had a bit of a scrub but it didn't seem to work and I was reluctant to use more than detergent in it as I drink out of that jug regularly and wasn't keen on poisoning myself with oven cleaner with my next cup of tea. Then I recalled reading something about using citric acid to clean out the build up in your jug and thought I would give it a go one afternoon. Here's what I did... First I dug out my container