I remember allot of discussion about carb cleaning.... spray choke cleaners, boiling lemon juice, simple green and other things like that, Berryman's or a can of NAPA carb cleaner seemed to take a while to become the go to cleaner for some reason.
But my favorites was how to clean rust from a tank, there was acid washes of all kinds , toilet bowl cleaners, electrolysis, rolling hardware inside the tank to get the rust out, 25 ways to prevent flash rust, what to do if you had flash rust and what the favorite tank seal/ coating might be.