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I have cleaned mine. Just make sure not to go CRAZY with the water. I know dealers clean the engines when they buy used trucks. So I dont think you will have an issue.
i used regular degreeser and some brushes/rags. warm up the engine a little and spray some degreaser. but if you have access to a hotsy than combine both. dont turn on the engine, spray degreaser let it sit for a few than use the hotsy. just make sure that you cover the altenator, intake, and other vurnable spots.
Here is my before and after without a steamwash, of coarse i did some paint touch ups here and there.
^^^^ wow that is one heck of a before and after! Anywho I have used simple green in the past to keep her all cleaned up and that seems to work very well. However mine was never nearly as dirty as sinus'
I use the engine cleaner at the car wash. It does wonders. I never had an issue and turns out great. But I agree with these guys a good steam jenny and some gunk engine degreaser will do the trick.