Can you give some instructions on how you used oven cleaner on the cast aluminum? Your intake manifold looks great!
Tony
Hi TJ—Sam’s Club sells a gallon of concentrated degreaser, similar to ZEP Purple. That does a good job too. There’s also a variety of wheel cleaners you can get at local auto parts stores. Pay attention; you want the kind that says “Do not use on aluminum”—that’s the kind that will work the surface and get it really clean. “HotRims” is one. You can also search online for “aluminum brighteners” as they are really the best. They work pretty fast…
The oven cleaner, and the degreasers, are caustic with a high pH. The aluminum brighteners and the wheel cleaners are acidic with a low pH. So they both work in different ways, but achieve the same goal.