There are a few things you can do to clean rust out of a motorcycle gas tank. The first is to use a vacuum cleaner with the hose attachment to suck the rust out of the tank. The second is to use a bucket and water to clean the tank. The third is to use a hairdryer on high heat to heat up the water and then pour it over the rust. The fourth is to use a vacuum cleaner with the hose attachment and suction to remove all of the rust from the tank.
