I took the day off from work Friday. I really wanted to see what I have and what was under all that dirt. So I rented the 2700 psi pressure washer from Home Depot late Thursday afternoon on a 24 hour rental.
Power wash: I power washed the engine compartment, front subframe, undercarriage, rear subframe, rear axle, springs, front suspension, wheel wells, and sides and front of body. I then followed Brian's advice and put Simple Green into a 1 gallon pump spray bottle that I bought at Home Depot too. Essentially you pump up the bottle,. Then you can hold down the trigger and it sprays. I sprayed the entire area above. I let it sit for 15-20 minutes. I fired up the pressure washer. And washed it again. Over the 3 hour process, tons of red clay came down along with grease particles. I used the pressure washer to spray all debris off the concrete and out in my yard.
Undercarriage: the undercarriage has black rustproof ripple spray that is exposed now that the red clay is gone. However there are plenty of areas that are just bare metal. Thus far I see only surface rust that can be treated with POR 15.
I wore coveralls, goggles, rubber boots and gloves. The rubber boots and gloves filled with water. Also I was washing with well water, and was surprised to find that I was actually shivering by the end because the water was so cold. I was totally soaked and glad to call it done. If you consider that you need to get out of your soaking wet clothes, get a shower, get dressed, empty the water out of the hoses, clean up the equipment, and return it to Home Depot, this becomes basically an all day job.
Passenger compartment had small leaks at front floor pans. Wiped up with rags. No leaks at rear floor pans or trunk. Surprised me.
Undercarriage pictures are basically organized rear to front
torque boxes look good
rear axle cleaned up nice too
left side rear subframe has been a problem for me with some cars, but not this one
also unexpected that emergency brake cables look tight
I guess the undercoating protected the car from the New Mexico red clay