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I've thought about this too. The deposits on the engine block and heads. I know it rubs right off but I was wondering what I could put on it to keep it from coming back or expanding. Not sure if silicon spray would help or not but I also don't want the smell blowing in through the vents.
what I use if its real dirty is the simple green and hose. then dry it off with compressed air and towels or my new air blaster from adams it works great. then I go back over with adams in and out spray and there Super VRT. keeps it looking better than new.
Like Justin, I use a dedicated motor coat to keep it looking better than new. First have to clean the engine real well, but once ready I hit it with Sonus Trim & Motor Kote. Keeps the engine cleaner far longer than washing alone in my experience.