You are going to find that rear engine diesels pick up a lot of dirt if you have a rear radiator with a high power fan sucking cooling air from the forward part of the coach. Personally, I have had no dirt related problems. That said, I do gentily power wash the rad from the rear to keep it clean for optimal cooling. You really need need to be careful to avoid bending the cooling fins on the radiator so stand back several feet. I would never wash the remainder of the engine for fear of damaging or introducing water into the multiple electrical assemblies. Good luck.
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Bob
09 Journey 39Z
Southern Ontario
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