no it dosent look like he sanded anything just painted over the gloss hood. Will a regular gas powered pressure washer work? I think mine is 5hp and 2200 or 2000 psi i beleive.
That should work fine, probably a little more pressure than a car wash, didn't mention that cause I wasn't sure you had one, not many people do.
To answer the question about color impregnated plastic Cujo, was the paint you stripped off really thick? Cause that is the color impregnated layer of the Acrylinatrile Butadene Styene (ABS) hood. If you don't believe me try plastic welding a crack in an Arctic Cat hood, it flakes away down to the second layer of black ABS plastic.
Watch How It's Made they have a good show on plastic. Maybe I'm wrong though, because I've only fixed, sanded and painted about 300 of those hoods in my shop.