My Z has been sitting for almost 2 yrs now with only half a tank of gas, so I'm pretty sure that the top half is rusted by now! My question: I have a friend that had bad rust in his gas tank on his motorcycle, he filled it up with CLR and water and let it sit for a few days! Has anyone ever done this before? I dont want to drop the gas tank. Any other solutions that will work better? I've heard of using pool acid!