Rear Windshield sprayer hose clogged

[squeasel]

Greetings All, Recently I posted about a mucous-based alien life form that had taken residency in the windshield fluid reservoir. I was able clean the reservoir and the hose from the pump (front) to the front nozzles.

However, the hose from the pump (rear) to the nozzle above the rear window is clogged as well. I have removed the nozzle and it is clean. I split the rear hose apart at a join about 10 inches from the pump. From the pump to the split is ok as well. However, I have tried pressure and vacuum on the section from the join to the rear windshield (theoretically this must run at least 10 feet) and get little to no air to pass (made it to 18 psi vacuum before getting worried).

Does anyone have experience with cleaning this hose? I am new to the Bentley manual but can't find the hose path there. All help appreciated.