How do I clean the Ali on my engine?

[911Fiddler]

She's taken on some light corrosion on the surface of the head, the Ali areas. Could polish it off but that's a bind and v hard to get into the nooks. Anybody know any chemical tricks to make the Ali clean and fresh again? I was thinking of trying caustic but don't want to risk damaging other materials.

[N7GTX]

A quick clean improvement can be had if you give it all a good spray with WD40. Also cleans and shines the plastic stuff too. Leave it to work for a day or so and wipe off any excess with a cloth.

[TheEnd]

Tile and grout cleaner, that has phosphoric acid in it.
That will take back the dirt, grease, and alloy oxidation.

http://www.artemisproducts.co.uk/aluminium-cleaner...

That's specifically stuff for cleaning alloy engine bits, but you can also find similar stuff in hardware shops for cleaning ceramic tiles. Check the labels looking for phosphoric acid.

[Carpmart]

Try some Rhino Goo, then rinse, followed by a coating WD40