I have a 55 gallon set up that I got at a yard sale. One of the challenges in getting it running is that it has dried salt all over the inside of the tank and around the edges of the equipment. I will be using the tank for freshwater till I have more experience in the hobby. How can I safely clean the stains? Just water and elbow grease? Will soaking help? Baking Soda? I know no soap, but thought you might have a helpful hint or two. Thanks very much!