Bird crap question

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I don’t think it’s bird crap

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Berries, acorns, and some leaves can make stains. Small pieces of metal will corrode and cause rust stains.

Hope I spell this right ,Plaster. The stains are black when I rub them with brush they turn green

Yes , was scared I would butcher it Thanks

Trees yes and no. Vacuum works every night for hours I do understand still things happen. How do I remove stains if at all

Chlorine can help remove the organic stains. There are some acids you can use for rust. Tie some granular chlorine in a sock. Attach it to your pool pole brush. Rub it on there and see if it comes off.

If it’s the standard white plaster try brushing the stains. They may come out in a couple brushing. You can also shock it and brush.

If that doesn’t work, get a dive mask and some fine grit sand paper and get to work but take it easy.

You need to find out what’s causing the staining and eliminate the problem.

I asked about fertilizer because some of it contains iron that will rust and stain surfaces.

This is why I recommend PebbleTec plaster for anyone building a pool because it is less likely to stain and hides any discoloration better.

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Algae. Sanitize your shite hole.

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Listen to this, OP.