How can I remove a 'white spirits' stain on white wallpaper

[DIYDAVE09]

Hi,
I have a stain (made by 'white spirits') on newly-decorated white wallpaper (ordinary paper, nothing fancy). Its appearance is like a water mark. I have sponged it with water on its own but this had no effect. I then tried dowsing it with bleach and this also failed to remove it. Does anyone know of a liquid solution that I can apply to it to remove it completely or even just partly remove it, without risking damage to the new wallpaper? Thanks,
dave