If the "safe mix" didn't work, the clog is likely a physical mass of lint and debris. A drain snake is an inexpensive tool (usually under $20) that can reach deep into the pipe.
The plumber, a young man named Dev, raised an eyebrow but obliged. He fed the fiber-optic camera into the drain. On the small monitor, the pipe walls glistened with decades of soap scum and rust. They passed the cleanout under the laundry room. Then the junction under the kitchen. Deeper. laundry drain pipe clogged
Rotate the handle to hook the clog and pull it out. Avoid simply pushing it further down, as it may get stuck in the main sewer line. 4. Clean the P-Trap If the "safe mix" didn't work, the clog