Martman
If that is the quick guide please don't look inside mine. I have found the easiest way to clean the inside is
a) roll down windows
b) open sunroof
c) drive as fast as you can until all dust is blown out.
Sometimes, depending on what you are following you or the road conditions, you can acquire fresh dust to enjoy.
Usually on rainy days I use a small household duster (swifter???) to grab all the dust and like BeeClass it only takes a few minutes.
I never eat or drink
in any car and that alone is a major factor in keeping clean.
Bill