Ok, so he isn't doing the video on a M3 but I thought these videos were excellent. I have very little detailing experience, and like a lot of people I want to know what I'm doing so that I can be able to wash my car myself properly and have it look immaculate.
The videos are split up depending on the operation. And are listed in sequential order.
4. clay bar
8. final results
Each video is around 9 minutes long and shows him doing a section of the car with the named operation.
After trying to filter through the seemingly endless amount of information of Autopia.org I found these videos to be a welcomed summary of such a detailed and elaborate process.
Here is another video from Drive Clean on the Drive youtube channel. This one video is comprised of a multitude of tips and recommendations to help you wash your cars.