The Clean Freak Method. How I do it anyway.
And some tips I learned at Carlisle. Thanks Bobby!
I use the dangerous technique as well. Only more so. I power wash at home.
First I run the engine until it gets warm.
Second I spray with simple green let soak then spray again. I also soak the underhood heat shield/cover with simple green. Then let soak again. Oh about 5 min or so. Hit hard enough with powerwasher to remove dirt/grease that is all. Make sure you rinse the whole car with clear water ,as I hear simple green will remove wax and I doubt it is safe for long term exposure to clear coat.
I usually do it in the morning so it can dry all day. If the car will start, restart engine and allow to rewarm. If not let stand a few hours. I have only had 1 case where the engine would not restart due to water intrusion. It restarted 1 hour later and ran fine. I spray all around the plugs and beneath the valve covers as well as in the plenum.
Now it is time to close the hood and wash the entire car. Remember to lift the hood before you wax the front of the car and let dry as the hood cover/shield will drip water on the cowling for quiet some time. After the engine is dry (as well as the under hood cover) I get out my artist oil paint brush, ( about 18 " long) a general fat round parts cleaning brush and Q-tips and get any remaining dirt from the crivices I can see with simple green. Yes I use a high power light to see into the cracks.
Any residue from the simple green I remove in the next step by applying Mothers Back to Black to everything black, using the long artists brush and the parts cleaning brush. The larger areas I apply it with a rag.
The underhood cover/shield gets a spray with high gloss tire shine.
I then wipe everything I can reach to remove as much of the Back to Black as possible. The final step (just added at Carlisle, ((thanks Chet)) is to apply a thin coat of Adams VRT to anything black I can reach. Buffing lightlywith a micro-fiber cloth.
And if required, I remove the windshiel wipers, the cowling, the CAI box and tubing and clean under and seperatley.
Oh yeah, I go back and wax the car afterward in case the simple green removed it.
Hope I got the order right cause too tired to proof read.