Hot water. As I said, it aaaaalmost works. By which I mean that it works but it takes more time combing and brushing than I would like. Charged water, or hot water, works wayyy better at removing excess oil when it is evenly distributed over the entire long hair. Can't slap some water on it and call it a day.
I'm trying to find a final last puzzle piece. Charged wooden comb might be it.