We recently moved house. There's a lot to do but it's generally bearable for now, except for the toilet which has a thick layer of limescale below the waterline - it's about 2mm thick and rock solid. I'm not really a domestic goddess and my usual 'chuck some bleach down there' technique hasn't worked in the least. Is a loo this bad redeemable or do I need to just hang on and try to ignore it until we get a new one? Any experience or advice would be amazing!