Oil stains on concrete

[Carol, Dave, and Zach Weiss]

After a suitable solvent and a rag for any stains
or surface oil, I use an old burger joint method:
wet mop/dry mop w/ a string mop and Tide w/ _very_
hot water, then again wet/dry with very hot clear
water.  I do this annually before the Pinewood
Derby workshop in my garage, which connects to the
family room that has light gold carpet, and haven't
tracked in any oil in four years.  This next one
should be the last....