Back when I took my Liberty, it was hit or miss on whether it would get washed or not.
I remember one time I took it in for a repair, I hadn't washed it in quite a while and it was, well, filthy. It was an expensive repair and when I paid and I picked it up at the end of the day, I found they had washed it this time. I was so happy to see it shiny and clean for once, that it completely outweighed the sadness I'd just had when I paid the bill. It was the most expensive car wash ever, but at the time it oddly felt totally worth it.
When I took the WK2 in for the first oil change, I forget how the conversation went, but they hinted they'd wash it so I asked them not to. They were fine with that.
I had to get a windshield replaced under warranty a few months ago and they didn't wash it. It didn't surprise me since I know they didn't really do the replacement; they merely drove it down the road to some glass shop. The inside was also pretty bad, too, though - The floor and seats were covered with chunks and small flecks of the black glue that held in the old windshield that they'd scraped off. I was really surprised they gave it back to me like that and hadn't bothered to do a quick vacuum after they drove it back from the glass shop. Or at least brushed all the stuff that was on the seats onto the floor.