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I’m at a loss as to why this has appeared? Tried Hot Sauce on it but that did zero. Any suggestions on how to remove it?

Try some hull cleaner on a rag. Or toilet bowl cleaner.

Magic erasers should get it. Then follow up with a wax.

Could also try some Soft Scrub on a damp rag

I've had that before on hard rubber surfaces. Usually a combination of sun/mildew/dirt, and age. Usually not too difficult to get off.

Thanks y’all, much appreciated!