With 7400 miles on mine and the same hood the engine doesnt really get dirty thru the scoop. Maybe in extreme cases like winter snow driving. Ill have to pop my hood and see.
It's funny. My wife said she didn't care if she might get arrested (if she is going fast enough), but when I mentioned that her car would get impounded and towed...... she worries that it might get scratched or something, ....so that is actually what keeps her lead foot somewhat under control.
You are right that I don't drive the SP many miles and only in perfect weather. However, it does get dust and pollen on it when I do drive it. Every time I take it out, I pop the hood and begin by dusting it with a large soft paint brush. Then I break out the shop vacuum and hit the hard to reach spots with the crevice tool. Finally, I use the brush to go over everything. Doing this takes all of 5 minutes and the engine ends up perfectly clean. I do the same thing with the wife's BMW. Her engine compartment has very good seals and gets very little dust, grime, or water. The Ram is the hardest to do because it get the most use. Takes me 10 minutes. The key to keeping engines clean is never really let them get dirty. Dust, pollen and grime left on the engines ends up getting damp or wet and then hardens making it difficult to remove. Never gets that way on any of my vehicles. When I sell or trade my vehicles, the engines look show room new.
I was just sorta kinda trying to be funny........ or being a smart-ass depending on your perspective.