This spot was on the floor of my garage and it was mostly made up of dried oil and dirt accumulation. Click image to enlarge.
Concrete Grime Cleaned Up
Using GreaseMaster at 400:1, in a spray bottle, I covered the area. After giving it a couple of minutes to make sure it soaked into the grime, I sprayed lightly to remoisten some of the dried areas and scrubbed it with a brush. After about 30-seconds of scrubbing, I wiped off the GreaseMaster and lifted grime. I followed up with a wet rag to remove what wasn't soaked up by the initial wipe (and to remove the residue) and dried it with a dry rag. As you can see, the areas hit with GreaseMaster are cleaner than the surrounding floor. It was able to repeat this on every grimy spot on the garage floor! Click image to enlarge.