Electroylisis works good, and my own little thing i like to do is Muratic acid, along with nuts and bolts inside, shake it up till the cows come home, then dump it out and look in at the shiny new surface. I WILL FOREWARN YOU...if the tank is thin, it may make it leak, but i've only had this happen one time.
I have officially caught the 6-wheel-sickness!!
"If your gonna be dumb, you better be Tough!"
"I have done so much, with so little, for so long, that I'm now capable of doing practically anything with virtually nothing...."
BUY AMERICAN..or...BYE AMERICA!!!