It could be cast-iron. If it is you could cut a section out and rework it with PVC.
Back in my digging days we would set up 2 cleanouts served by opposite wye's with street 45's turned up with cleanout caps.
This way when the cable was dropped down either cleanout, there was no debating which way that cable was heading. They make a uni-directional cleanout tee that will work but most times when the drain is clogged, you can't see that.
You go entirely off how the cable glides in that pipe as your running the machine. The cable usually rubs against the opposite side you're trying to clear.