Marks on shower from new squiggles I can’t remove any ideas
+3
tried lemon work salt with vinagar
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I would try a Mr. Clean Magic Eraser
Here's a great video! https://www.youtube.com/watch?v=47Wu_kaxVg4
Try toothpaste. Really.
Try using Barkeeper's Friend. Its cleaning strength is great.
Perhaps try bi carb sofa and water - put a spoon of bi carb onto the area and with a dance sponge/scourer rub the area.