First off: I did not use the machine and not clean it.
I got a concrete mixer for free. Awesome. But it has a buildup of 2-3" of concrete on the inside of the machine. The outside it beat to hell from previous users smacking it to knock off buildup. I guess that's why it was free.
I haven't gotten started on removing the old concrete yet. What tips do you guys have? Is there a miracle remover that I'm not aware of? #diy