Rich
Clean it of what?
If it's oil free take the stuff for bead blasting or vapour blasting. Otherwise you can do a fair job with nothing other than Bio Detergent and hot water. Gobbles up most gunge.
Corrosion can be removed with washing soda, Sodium Carbonate. Don't leave it in, it fizzes cheerfully, it IS corrosive to Alum. Alloy.
I use that method before painting ally. sheet. It produces a matt grey finish that takes some paint better, particularly 'Bondaprimer'. Try a test on a bit of scrap if you've never done it,
Why not have a look at a Vintage Bike forum or two, no doubt you'll find blasting sevices suggested, common enough requirement for bike c/cases etc.
Dave BC