What is this?

So, I went to clean a plugged lav drain at a car dealership. It was a 2" PVC drain in a women's restroom. It went fairly easy and the plug was not far out. I ran extra so I was in a 3" drain too. When I pulled back the cable I got a bunch of little pieces on the cable and a big one at the end of the cable. It was slimy and almost reminds me of slimy intestines. Can anyone tell me what it is?


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