Acid-based aluminum cleaner worked like a charm for me.

Spay on, brush deposits, rinse off.

I don't know the name... Got it from my buddy's shop. Could ask him tomorrow, though.

"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy

Proud owner of an 88 Montero (with a blown engine).