Cleaning pistons
I think the outboard motors and carbs, intakes used in the marine world would be mostly aluminum?
It’s definitely good at removing carbon buildup.
I had a 3.23 posi 8.75 489 case I bought off eBay. Nobody was bidding on it, as it was covered in surface rust, like it was in a humid garage idk.
Anyways I had a can of the Johnsen engine tune cleaner in a can laying around I’d been saving, as it’s not cheap.
It literally just dissolved the rust, it bubbles awhile, thing looked new after rinsing it with brake cleaner. Turned out to be a quiet set of gears with a good suregrip, and ran it for years.
