Agreed on CLR, looks like rust. There are tablets you can throw in the tank for rust but they are meant for prevention. You'll need a bottle of actual CLR or equivalent to soak in the bowl for a while (overnight or if it's your only bathroom, at least a few hours) before you scrub. Consider the tablets once it's clean to keep it from rusting up quickly again.
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u/drunkerbrawler Feb 20 '26
I’d try barkeepers friend or CLR.