How do I clean a rusty bathtub?

There are several metallic stains and other stains that bleach and lime remover don't remove. Part of the ceramic coat is gone! Any help, please. I'm sure my landlord is not up to this! I'd like the greenest solutions to my problem. Any ideas about how to discourage my cat from licking this is also helpful. Thank you.
q how do i rehabilitate my bathtub drain area , cleaning tips, go green, house cleaning, Black spot ceramic gon Yellow spot who knows Gritty down stain don t know
Black spot, ceramic gon. Yellow spot, who knows Gritty down stain-don't know
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