Step 1: Take pictures of stays (ie brackets) and bolts so you remember where the hardware goes.
Step 2: Take some good "before" shots. Like every good jenny craig or proactiv commercial, having a good "before" picture is half the battle.
Step 3: Buy Simple Green (you don't even need the "industrial" or "automotive" stuff... the regular bottle works great). As the bottle tells you, spray it on, scrub a little, and then follow it up with a damp cloth... a microfiber one helps prevent scratching the pristine paintwork.
Here's what it looks like after the damp cloth:
And here's some good Before and After shots:
Front:
Rear
And the engine room... from Halfway done, to Done. It's a pain in the butt getting behind some of those hard lines without taking them off though:
And finally the denouement, the jenny craig Before and After shots:
Definitely worth it.
As a side benefit, your garage smells like one of those smelly, yet delightful, green Mr Sketch markers you had as a kid.
please enjoy.
-J