100LL
http://www.shell.com/static/au-en/downloads/aviation/avgas_100ll_pds.pdf
easy to come by? heck yes. step one: walk out of office, go into shop. step one(a) get a bucket, preferably a clean one. step two: here you have some options. either sump some fuel from any number of airplanes you see within 50 ft of the hangar door, or walk a hundred feet further and sump some from a fuel truck or get some out of the barrels full of throw away fuel from maintenance being performed at the shop next door. step three, go back in the hangar and dip a rag in the aformentioned bucket then wipe the residue from your automobile. step four wash your automobile. (then clean the hangar floor, your mother doesnt work here)
alternate step 2: for this one you dont even have to go outside the hangar, sump some jet A this should probably work, but it may take a little extra time and/or scrubbing. proceed to steps 3 and 4.
see you could have performed steps 1-4 in less time than it took to write this up.