/ck/ - Food & Cooking

I think what's inside my Kyusu is limescale, what's the best way to remove it? It's been building up and I think it's actually affecting the taste of my tea now.
As it's unglazed, I have no clue what to use for removing it, I was thinking of just filling it with some hot water for a while, then scrubbing it with something like a new toothbrush (to avoid contaminating it).