So I have the classic signs of the main drain being clogged (toilet bubbling while running the dishwasher/clothes washer). I found the access in the front flower bed right next to the water faucet. Problem is where I expected to find a cap to access the drain and begin the process of cleaning it out, there is none. There's the metal pipe and then what looks like a PVC sleeve? Do I remove the sleeve? I will include a couple of photos. Thanks in advance to anyone who help me out with this one, I'm not much of a plumber.