I did this stone cold and have not yet started her up. I used orange blast and a soft brush, used small amounts of water from a garden hose (no pressure washer) as I did not want to flood the engine compartment. I Used old towels to keep overspray off the trunk and interior. I used a new product on the plastic that does not leave an oily residue, after all if left oily it would simply collect dust and particles at a greater level than if left dry. I am pleased so far...we will see how this holds up.