All the dip cleaner does is soften the deposits- - - -it doesn't remove them. Once you're through soaking, rinse the parts repeatedly in HOT water (almost boiling) and use lots of high pressure air from a needle-tip blow gun to clean out all the drilled passages. One instructor I had at the General Motors training center in Memphis used to say "Put 55 gallons of air through every hole in the castings!" The air is what does the cleaning, not the dip solution.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!