one thing you could try is to get a long screw tape it to the end of the cane push the cane down the tube turn the cane a couple of turns clockwise,this might take the screw into the sock,you could then pull it out,let us know if it works, good luck, Ray
when i get stuff stuck up my pipe i blast it out with the hose pipe. Hold it up at both ends for the pressure to build up then lwet one end go on the floor and tonnes of stuff comes out, well it does with mine. could try the jet wash if you got one