Walk in shower drain not draining quickly enough
I have a walk in shower that was built in the late 1920s. I use it quite frequently until a few weeks ago the drain started to back up water into the stall. I tried to clear out the drain with a snake and got a bunch of hair and then all of a sudden black sludge started coming out of the floor drain. The drain does work it just takes it a long time to drain all the water. I have tried baking soda and vinegar and even bleach poured down the drain but nothing has worked. I don't have the money to call a professional and I am lost as to what I can do next to fix the drain. The drain is really slow but still works so I am wondering if it is built up oil and grease instead of hair because I have cleared all the hair out that was in the pipe. What should I do next? Try boiling water and see if it flushes the rest of the debris out?