How do you remove a water marks at glasses?

Do you mean how do you get rid of water marks on drinking glasses? If so, the best way I know is to fill your sink with warm water, add a bit of liquid dishwashing soap, and then add 2 cups of vinegar to the water. Put the glasses in and let them sit for about 15 minutes. Then hand wash them with the liquid soap, rinse, and dry them with a soft cloth. It sounds time consuming, but it works!

If I misunderstood you, and you mean "How do you remove water marks that glasses can leave behind" (like on wood surfaces), mayonnaise is actually the best thing I've found! You just rub a bit into the wood and it gets rid of them. :)