Cleaning and Stain Removal - Water Stain on Kitchen Worktop

Hi there
I really need some help. I have a fairly cheap fitted kitchen with a standard laminate work top in a dark pattern. Ive had it some time and its usually really easy to clean but I have noticed a ring on it (like you get when you put a cup on a wooden table, which I guess is a water stain ring) I cant think what else it could be but I didn't think laminate could stain in this way. Anyway, I have tried normal cleaner and a little bicarb of soda but the ring is there and hasn't changed at all. Can anyone suggest anything I can do to remove this horrible stain please.
Thank you

I it was a water ring that dried and left mineral deposit, soak off with white vinegar. If a household cleaner was placed on the counter and it resulted in discoloration, the discoloration is permanent. If something that was too hot was placed on the counter, the damage is permanent.