I'm trying to clean the well used Edelbrock aluminum intake manifold from my '56 before I put it on the new engine. I've cleaned all the grease, gasket pookie and paint overspray off it but it still looks dirty and unevenly stained. Any ideas on making it look brighter?

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.