Understanding how to clean car door panels as a professional auto detailer is an extremely important concept and part of the detailing process to understa.
Plastic door panel cleaner.
The most popular trim restorer on the market is the trinova formula which is a cheaper alternative to the gtechniq that darkens and shines the surface.
Spray plastic cleaner onto a foam applicator pad.
Cleaning a door panel is a multi step process including vacuuming up any dirt or debris wiping down the various surfaces with an appropriate cleaner detailing the panel and polishing the door panel to make it shine.
Wipe the interior plastic with the dampened applicator pad.
Get the applicator pad damp with cleaner.
If you spray directly onto parts like the dashboard or door panel the mist will settle on your windows making more work for you to clean your car later on.