Whether your car's doors have stains from spilled drinks or food, or are just faded, it's easy to get them looking like new again. All it takes is a few simple steps, and the right cleaners.
The first thing you'll want to do is vacuum the panels, including all the nooks and crannies. This will help remove the bulk of loose dirt and debris, so you won't smear it when you wipe down the surfaces later. You'll also want to use a brush attachment or crevice tool to get into storage pockets and other tight spaces.
Once the panels are dry, you'll want to apply a protectant to them. This will help keep them from being scratched, and it can also help prevent UV rays from damaging the plastic. There are a few different types of protectants out there, so choose one that is safe for your door panel's surface material.
You can also try some scrubbing pads or even some melamine foam, though this may require a bit more work than just wiping down with an all-purpose cleaner. This will also help make those hard-to-remove scuff marks disappear, but it's still best to use these methods sparingly so you don't damage the surface of your car's door panels.