flushing a gas tank?

[kulturekat]

ok this may sound dumb and so basic but is there a specific way i have to flush a gas tank out. its not installed on the truck its taken off and all by itself the few things i read said i can just wash it out and as long as the water dries well enough to not mix with the gas then ill be ok... my question is this good enough or is there something else i have to do or is this not even acceptable. any info would be greatly appreciated.