Hi All,
I've searched, but does anyone have tips on cleaning the sand cast parts (crinkle finish type stuff on manifolds, crossover tubes on a 603) under the hood?

I want to give the 87 a good once over underneath and the crossover tube is really dirty, among a bunch of other parts!

Thanks in advance!

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91 350SD
14 F150 Eco
19 Fusion Hybrid
11 GT500