How do you clean these orange water marks?

Does anyone know how to clean this orange ring in the toilet bowl? I clean our entire bathroom once a week, but this orange is just getting worse and worse. We live in an apartment, I don't know if it's the water they use here or maybe the pipes are old and rusty? There's orange water marks stained in... show more Does anyone know how to clean this orange ring in the toilet bowl? I clean our entire bathroom once a week, but this orange is just getting worse and worse. We live in an apartment, I don't know if it's the water they use here or maybe the pipes are old and rusty? There's orange water marks stained in our bath tub too where the spout is. Help please!! How do you clean this off?!
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