[sidewaysalfa]

I have since found some engine cleaner that I use on realllllly thick crud.
More efficient than Simple Green but a lot more toxic to my lungs. And the 15 minutes is about time to have a beer!!!
I would recomend the little steam cleaner. It really works good with whatever degreaser you use. And it is useful around the house to clean up stuff.
Also a spatula may speed up cleaning up difficult to reach places or places like frame rails that accumulate a lot of dirt and grease.
With no running gear you will be able to get a bunch of the bottom clean.
That way any new fluids you see later are new problems, not something from the past.

You may not stain the driveway any more than your normal oil leaks stain now. Since you are diluting the mess you wash off just washing the driveway from time to time should keep things pretty clean.
I do most of the cleaning in the garage where the concrete is sealed so no stains are left behind.

And also watch out for any Polution Control people in your town. The amount of toxic waste that washes off your car could be a potential problem.