I have an 08 jeep wrangler, after some offroading my engine block and heads got really muddy. I tried quickly washing the engine with soap and water a few hours after but it didn`t work. Now the aluminum is stained tan. I tried some gunk and rewashing but it still is discolored. I`m gonna see if I can find some cd2 to try but wondering if there is some trick to getting the tan discoloration out of aluminum?
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