Engine Washing ?

[Topless]

I did this shortly after I bought the car. I carefully hand wiped and cleaned the entire top of the motor and all the tubing and hoses.... One week later I opened the motor cover to show a friend my concours workmanship and it was back to a filthy freekin mess. What gives, I just cleaned this??? Then I learned about Boxster airflow and how it picks up air from under the car, cools the trans and oil cooler and goes out the passenger side vent. Every time I drive down a dusty street or pull off the road it buries my engine in dust. I'm now over it.