More Research Required
It's interesting that pipes accumulate ice at relatively warm temperatures, and little when really cold.
So we either prevent ice accumulation by heating, coatings or additives, or have mechanisms to avoid clogging when the ice sloughs off in warmer temperatures.
Boeing's original procedures seemed directed to fuel waxing.
It's interesting to see that the "ice" lining the pipes is not pure water ice but a mixture of fuel and water.
The Chinese fuel may have a part to play as one of the fractions may have a low temperature affinity for water.
It would be interesting to know the fuel fractions incorporated in the "ice" lining the pipes.