I recieved my new fish tank today. It is a 90 gallon instead of an 80 gallon. It was my sister and she had saltwater fish in it. Then it was out in her shed. It is really dirty and there is salt water buildup or lime build up. What is the best way to clean it up? I don't want to use any harsh solvents. Can I just use hot water or with that not take all of the salt out?