![Is this rust or corrosion? Tried using CLR and scrubbing and it's still there. Just a tenant. Also, what would cause this? Toilet is half a year old : r/Plumbing Is this rust or corrosion? Tried using CLR and scrubbing and it's still there. Just a tenant. Also, what would cause this? Toilet is half a year old : r/Plumbing](https://preview.redd.it/lmfywvnco8841.jpg?auto=webp&s=7eba9ea736ca03518b0aa5a10f1cd29b1e37bba9)
Is this rust or corrosion? Tried using CLR and scrubbing and it's still there. Just a tenant. Also, what would cause this? Toilet is half a year old : r/Plumbing
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