That'd be my bike you're talking about.
It depends on what parts you're talking about. Some of the aluminum parts were bead blasted (hubs, heads, cylinders), some were cleaned with aluminum wheel cleaner and a hand held wire brush (cases, hubs), Some with carb cleaner and a brush (cases, carbs), some were polished with a buffer (sidecovers, misc smaller stuff), some a combination of the above...
Some of the steel parts were sand blasted and then electroplated. Other parts were simply replaced. Nothing was rechromed.