Exterior acid wash? or ?

[ironheadxlch]

Hey all..............1951 Clipper restoration in progress. Lots of hail damage, small dings, a few deep scratches etc... so I do not wish to polish as it would only highlight the damage. I would however like the finish to be consistent overall sort of like the newer AS's matt aluminum look or perhaps even less shiny than that. At the moment the finish shows black marks from tarps and ropes having rubbed the surface, hardwater marks and spots, general soiling and grime from 60 years of the elements. I have tried most RV and household cleaners without effect. I tried automotive rubbing compounds as well as some auto paint polishing compounds and they tend to shine the surface much like the aluminum polishes so that's not working. I investigated soda blasting and that is way too aggresive and leaves a very textured surface. I have heard the term "acid wash" that some polishers use prior to the polishing. Not sure what that is or what it will do. Any ideas out there? Your help and or ideas would be appreciated.
Thanks

[mopariac]

Here is the info I recieved when I ordered the acid for my trailer...

Here’s the cut sheet on the acid wash. This product is available from aircraftspruce.com but you may be able to find the equivalent locally. Just be sure it is phosphoric acid without any additional chemicals.