I don't know what the preferred method is, but I usually use Gumout carb&choke cleaner and an old toothbrush to free up stubborn deposits and wipe them out with a rag or paper towels. The gumout will actually start to dissolve the plastic toothbrush but not the bristles. I use them anyway but maybe a wooden brush with brass bristles might be a better idea. After cleaning out the throttle body you will probably want to lubricate the throttle shaft pivot points with a light oil or spray lube. Not too much or it will just gum up and collect dirt. Clean and lub the linkages also and make sure everything is working smoothly. More than one "hanging idle" has been caused by a carboned up throttle body, however, as mentioned, vacuum leaks are also likely suspects. Replace any vacuum hoses that even look questionable. Another thing you might want to check out is your PCV valve. (I assume Honda's have one, my knowledge of automobiles is very general and not Honda specific, in fact, I know very little about them as I just got my first one a week or so ago). The PCV valve is supposed to be replaced at every tune up but often gets ignored.