my brother was given a 4hp sea king and the tank is rusty. what would be a good way to clean the thin layer of rust in the tank? also what year/model would this engine be here are the numbers i found on the side<br /><br />mod: vwb52004d<br />ser: 28x22894<br /><br />thanks for any info you guys can help me out with.<br /><br />adam