I changed the oil in my pickup a couple months ago, and had about a quart of clean oil left in the container when I was done. I don't have a garage or other handy place to keep stuff like this, so I just left it in the bed of my truck. Unfortunately the lid was not completely sealed, and a good amount of the oil leaked out and now covers the bed of my truck.
My question is, what is the best approach to cleaning up this mess? So far I've used (a lot of) paper towels to get most of it off, and then emptied half a bottle of dish soap into the back of my truck and scrubbed with a toothbrush to get the rest, and I seem to have created a thick, goopy oil-soap residue that's hard to get off. Should I just keep scrubbing and rinsing, or is there a better way?