We picked up a older tank. Only a few scatchs. Problem is there is water marks on outside of tank I can't get off. Looks like water dripped down side and got left. Well I've tried glass cleaners and bathtub scumm cleaners and can't get it off. Any Ideas? As far as I know it has only been used for fresswater. Can I buff the glass? Oh and this tank is up and running and stucked.
