Cleaing out a Model A gas tank

[Juls]

Several years ago I decided to purchase my great grandmother's 1929 Model A. Seeing as though I'm a mechanically challenged female it may not have been the best decision. The car is in original condition and I use to drive it around the neighborhood until the rust in the gas tank became an issue. It has been in the garage up on blocks for probably close to 10 years and I'm looking for away to clean up the tank so I can start driving it again. Any ideas?