Washing Your Aluminum Fuel Tank
A new aluminum fuel tank is great when you first get it. Not only is it not as heavy as a steel tank and therefore can be more fuel-efficient, you may imagine cleaning it isn't too tough. While that may be true, you still need to concentrate on these suggestions.
Use Soapy Water First
Starting the cleaning process with water and soap is smart. Dip a rag into soapy water and wipe off the entire tank liberally.