There's a web site mentioned a few pages back that WS has approved. Its run by a woman journalist, Rebecca Knight, who has done a lot of research on Ray's case. She has copies of the police report describing this.
It's called Final Argument - The Disappearance of Ray Gricar
Final Argument explores shortcomings in the investigation of Ray Gricar’s 2005 disappearance using evidence from the police files that has never before been released to the public.
raygricar.com
She has a series of podcasts that are very good.
Re wiping down the interior of Ray's car, JMO there would have been no reason for Ray to wipe down the interior of his own car. It's assumed that someone else did so to erase evidence that they were in Ray's car.