yeah, its a good idea to clean em... well, i have heard of using degreaser. never anything about the boiling water but if there are no rubber parts or anything, it makes sense...
guess im not much help huh? id say both ways are good.
i know with my dirtbike, we put somethin in gasoline to clean it... my air filter or somethin??? i dunno.
i think ill use the gumout too on my rev... i wanna spoil that thing, since ill be on it!