Try using a paste made with baking soda and see if that will scrub it off.
Welcome to the Pool Forum, by the way! We've all done the Walmart thing with the buggy loaded with bleach bottles and gotten the stares and questions. One time when i was asked why I was buying so much, I just looked at the clerk with a straight face and said, "we are just really dirty." She just looked back. I didn't crack a smile or anything. I'm sure she thought I was strange, but who cares?
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