After a really through cleaning of the engine and compartment, I used a can of clear engine paint with great success. Cleans up the dull finish on the aircleaner and engine block. And....since it is clear, overspray is not really an issue. Or course you need to make sure it is engine paint so that it is heat resistant. Some folks may not like it, but on my older 240D it looks superb after 3 years
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