What are some alternate ways for removing oil stains from a concrete floor? We've had pretty good results from scrubbing with trisodium phosphate (TSP) and hot water but the method is time consuming and laborious.
If it's a relatively fresh oil spot and won't be exposed to moisture, try dusting on portland cement. Leave the dry cement on the stain overnight then sweep it off and pick it up with a dust pan. Repeat the process if all the oil isn't removed. This method reportedly draws oil out of the concrete.