A brown stain has suddenly appeared at the back of the toilet bowl. I assume it is a water stain but the water from the cistern is perfectly clean and there is no staining anywhere else. Any ideas as to how I can stop the stain re-appearing?
Generally the mark is caused by rust. Either something inside the cistern is going rusty and the water is marking the pan or some piece of iron has come into contact with the bowl and is rusting.
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