I paid for a mid-level car wash. Three different groups of people worked on my car at three different times. The follow-on groups repeated cleaning that had already been done, and then other cleaning was never done until i asked them to when they said my car was ready. I also waited a long time.
If you can do a better job of managing personnel assigned to each car, things won't get missed, it will get done faster, and I will give this car wash a higher rating. Until then, I'll be going elsewhere.