How do I remove a dry water mark from an lcd screen?

I was using a 'screen target' and it's left what looks like a dried up water mark on my screen - any idea how to remove it? My monitor is a 26" Samsung T260, and it's a matte finish, not glossy. I've tried wiping it with a cloth but that hasn't worked. If I go out and get some screen... show more I was using a 'screen target' and it's left what looks like a dried up water mark on my screen - any idea how to remove it? My monitor is a 26" Samsung T260, and it's a matte finish, not glossy.

I've tried wiping it with a cloth but that hasn't worked. If I go out and get some screen wipes, will they help? Or do I just need to leave it to dry out?

Thanks
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