I think some orange paint for the grate and the rest of the reliefs cuts would do the trick! Why fight nature when you can join it? (I'm kidding, but who knows?)
That looks like rust/iron stain. Some type of acid will clean it if it is rust. Vinegar, ascorbic acid, muriatic acid diluted 2 or 3 to 1, etc. Always add acid to water.
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