7 of 8 people found the following review helpful
easy, inexpensive kettle descaler,
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This review is from: 500g Citric Acid (Best Quality) (Kitchen & Home)
I use in conjunction with a 50p 'kettle protector' from Wilkinsons - 1 small teaspoon of citric acid in half a kettle of water once a week (leave for about 5 minutes, then rinse, obviously!) and the inside of the kettle stays pristine. Better than any proprietary brand of descaler I've found to date.