I'm not sure what you use to clean concrete but where I live I have mold issues in my concrete. I have found Tide with Bleach works pretty well. The black in the concrete is some times mold and the Tide works on mold and grease. Shop looks great!
The busy part has been wheel bearings in the wife's car. I got her old CTS with a check engine light. Got to do timing chains. Following weekend transmission in my 05 Dodge with a Cummins. I hate working on my own vehicles. I work on big trucks for a fleet for a living