Did the wife's car today. Was a lot of old grease etc o. The inside of the door shuts. I've some muck off bio degreaser for my bike. Quick squirt, agitate with brush and rinse with a diffuser full of water. Shiny inside doors now.
Whenever I want to see a freshly detailed car looking stunning I watch this video.
[video=youtube;sNcXWajJzEE]https://www.youtube.com/watch?v=sNcXWajJzEE[/video]