I don't normally use the term "visciously clogged" often, but in this case...it's an understatement. I don't know what's in there, but it's just gotten worse. Here's the scenario. It's a standalone shower, no tub, and no overflow cap unless it's hidden behind the shower head mount. I am the sole user of the shower, and do not have mounds of hair on me to the point where that would clog it. I used to be able to give it a quick few plunges and the water would drain overnight. One day I tried using a simple drain auger, a zip it tool, and four different types of plungers, and guess what? It won't even drain no matter how long I let it sit. I plunge it 20 times or so every day hoping for something good to happen. Things to note: none of the plungers seem to get a solid seal, so I don't think it's sucking anything out, rather pushing it in further. Like I said, I could plunge no problem, and it would drain eventually. But things changed once I did the auger. Other thing to note: I plunged it the other night with no result, and after I did that, I walked past my laundry room and noticed that the drain in there had standing water and for a few seconds, there were air bubbles. But only for a few seconds, then nothing. I am going to try plunging and the auger in the laundry room drain tomorrow, but if anyone has any good ideas, I am open to suggestions! Thank you!