Muriatic acid

It's used in small engine repair to remove aluminum deposits from the crankshaft where the crank rides on the aluminum engine case without a bearing when the engine kicks a rod or rods from low oil. Whew, my English teacher wouldn't like that run-on. lol

Yeah, they take the "oomph" out of carb dip and a zillion other things, but we're still "ok" with that stuff.