I work at an independent shop, not a dealership, but this goes for both. If you are having some type of work done that requires the techs to use access panels inside, try to have your car clean inside. I'm not saying it needs to be detailed, just not covered in trash. We had a BMW in there one day and we had to get to part of the evap system that was in the spare tire well, and the owner had trash, dishes, old food, books, clothes, everything in their trunk. It just makes it easier to work on and more likely to be done right because they work be frustrated before they even get to the repair aspect because they had to wade through your trash.