Discoloration…how to remove it?

[TX777]

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?

[Big Block Power]

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

[NautiWeasel]

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

[sailor55330]

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.

[TX777]

Thanks y’all, much appreciated!