Removing Clay from Terrattoa Pipe

I have approx. 20 feet of 6 inch ID clogged terracotta pipe in my basement drain system, plugged with clay soil. I have the far southern end excavated for access, approx. 20 ft. of plugged pipe, then a drain at the mid point, and then the drain exists the house at the north (this section is clear). Given that it's in the basement, I did not want to use a water jet, and my big shop vac isn't cutting it.



After it's unclogged, I plan to sleeve PVC inside the clogged section of pipe to the mid-point drain.



Thanks

Removing Clay from Terrattoa Pipe