I'm lazy as you are probably aware.. I used to keep a glass bottle of cleaner and when it came time for a good cleaning, soak the complete BCG in it for a day or two, pull apart and finish cleaning.
Scraping is a PITA. But then again hard carbon fouling has to be taken out by abrasives in the throat area.. but in that area its an issue, but in the tail of the bolt... other than wanting it clean and shiny there isn't any real reason to do it IMHO... unless you have the other DI standing there....
