Well, personally I never have thought her car was washed that day because it's filthy. Seems simple to me. If her car was driven by the perp after the wash, the window of time was very small and cannot account for that amount of dirt. Lots of sticky looking exhaust dirt on the back. Just doesn't fit IMO. I could see dust after a wash, I could see mud around the wheels. I can't see the obviously built up grime that is on that car.
I don't think her car was washed that day, despite the account of an eyewitness. "Eyewitnesses" can be mistaken, especially when recalling a missing person, especially after the fact. It would be easy to think you had seen that person. Lots of red cars driven by lots of tall, thin dark haired girls in this town.
I disagree---respectfully of course! Whenever I send my car through the automatic carwash it NEVER cleans the back end of the car well-----I have to do it by hand to get the serious grime esp. where the exhaust area would be.
I think that there was a carwash and that the perp purposefully took her to the car wash to take away her phone and/or take control of the situation. I asked H2Oskier about the SuperWash details----he said that it is a 4 min. car wash and is extremely loud (too loud to hear someone talking on your cell phone). Perfect place to threaten, physically take over and/or hit someone on the head.