And there is a difference between ירק (with a resting first radical) and רקק (with repeated last two radicals): ירק is designated for saliva that exits from the mouth, and רקק includes also drool, mucus, and phlegm.

And with respect to the special verbs for spilling and disposing and the verb רק, the word עליו always comes afterwards. And the prefix letter ב that comes afterwards is only correct when it is in conjunction with יד (hand).