Recently I removed the gas tank from my 73 240z to replace the fuel guage sending unit and to clean it up a bit. The tank was out of the car for about a week befor I put it back in. I have 2 glass inline fuel filters that are now collecting a large amount of rust. I guess I should have done a proceedure I believe is called schloshing but I wasn't sure what to coat the inside of the tank with. If anyone can tell me what I should use for this process and where to buy it I would greatly appreciate it. Thanks again