How do I clean my baseboards? Is this mold or mildew?

What about it?

Hi there. I was wondering how do I clean my baseboards? This one looks like it might have water damage. It is right next to the shower. It has been like this for 7 years and I’m embarrassed to say I have ignored it. Could it be mold and if so could the mold have spread into the wall? Can I fix it or do I have to redo the baseboard? Thanks!

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