I'm certainly no friend of the crap either... but w/e. Running a good fuel and good oil will keep things just as clean and you don't risk large particulate freeing up and clogging things. I'll occasionally spray some distilled water into the intake tract to steam the cylinders, but it's easier for me as I don't have an AFM.
BUT, since you asked, most people use either the PCV port on the TB or the brake booster line on the upper intake plenum (or surge tank if you're accustomed to that term).
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