Just putting anything on the hose and squirting some in the tubes is not enough.
Cut a length of edge trimmer line a little over twice the length of the coolant tube.
Tie a cloth rag to the middle of the edge line and soak with whatever lube you want to use. (I used less than half a bottle of Tire Wet)
Pull the rag through the tube multiple times, turning and resoaking the rag for the pull back through. Object, to coat the top and sides of the tube so it isn't dry.
Coat the hose and pull through.
I was able to pull them through by hand this way.
The weird thing was, it got easier to pull after getting the coolant line pulled about the quarter to half way point.