I've nowspent hours scrubbing and tried everything suggested on this forum, plus bleach and brillo pads, nothing has worked (not washing up liquid or shampoo I'm afraid). However, any fresh stain is easily removed with the normal pool cleaning products. I wish I knew what brand had caused the problem. I too would love to ban the stuff, it has runied my lovely and expensive new liner which has only been in since April.
Has anyone any other ideas of what might work? I'm tempted to use liquid chlorine, I would rather have a white mark than that awful sickly yellow colour.
The only thing is that the guests haven't commented on it, when I apologised about it being there , they said they hadn't even noticed it.
Would having a shower that guests have to use before getting in the pool have any effect on reducung the greasy tidemark?