Zep-a-lume would knock brake crud off in nothing flat but you have to be able to rinse (drown) it within a few seconds.
It could mess a finish up in no time if left on there. Contains acid. Meant for cleaning aluminum truck trailers but I have seen a video where it was used on a Porsche engine case.
Please research plenty. I have used it many times on wheels. Dilutible for the timid. :-)
https://zep.com/products/zep-a-lume-106324