Do you mean clean? as in general dirt and stuff?
If so, then truck wash is great.

When i was into 4wding, after a play in the mud, id go home, put some truck wash in the engine bay, left it for a bit, then hit it with the hose. came up a treat. For real hard to get to stuff, i used to hig pressure hose on a lower setting.

supercheap sells it. Think is called CT-18.

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[WREXX] 2005 Club Spec Evo 8