How do I permanently get rid of mold/mildew on my bathtub?

I’ve used bleach for quite some time now, but it just keeps coming back. I use the fan after and during showers and baths. Why does it keep coming back and how do I get rid of it?
I do that, not with the rag just pouring it on the mold/mildew. It still comes back after a few this normal then? It’s the first bathroom that I’ve had where this happens.
Sue..It’s in an apartment…all around the tub where the caulking lays. It’s been replaced several times, yet to no avail.

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