Can't remove toilet bowl stain buildup
I have never had this problem before. There is a greenish buildup on the bottom of my toilet bowl that will not come off. I thought it was some sort of mineral buildup (lime, hard water, etc.) I have emptied the bowl of its water and poured in a lime/rust remover liquid and let it sit. But no matter how much I scrubbed, it wouldn't come off. Any suggestions?