Noooooooooooooooooooooooo, not the oven cleaner! BAD CALL grasshopper.
I'd hand sanded and polished a 1969 CB350 engine to such a luster that I had to detail the upper frame, wiring and bottom of the fuel tank. (the reflection on the top fin was like a mirror) and yes, it was a sand casting when I started.
I decided to remove the engine so I could paint the frame and polish the areas that were outta reach.
I got a couple cans of oven cleaner at the 98 cent store and proceded to spray it on some of the areas that I couldn't access with the engine installed in the frame. STUPID MOVE., Sorry, "ignorant move"
I didn't use any type of power tools back then to polish...... It took the rest of the summer to restore the engine to the state that it was in before I spent $2 cleaning it. Caustic sodas and acids are not very friendly to alloy.
Likewise, if the factory paint is intact, carb cleaner and some rubbing compound will restore it. But if it has been repainted...... A black mark on the driveway and several cans of paint will fix that Boo Boo
As for the carbs, I will indeed try the green goo. You can get some brass or stainless brushes for a Dremil that will "manually" remove the white rust from the carbs. I like goo. (when it works for me)