Tips for cleaning the inside of car doors?

I just went out to the truck to get something and was greeted to a stream of water when I opened the door. Shook the door and heard sloshing.

So I turned the truck around, and doing that seemed to make it all go away, no more sloshing.

Quick Google search tells me the drains in the doors can clog, so I pulled out all the plastic drain caps. 

On all 4 doors, the drain where the 2 doors meet was clogged. 

I scraped out what I could with sticks, but is there a good way to actually clean that stuff out? And treat it to prevent rot?

Blast of water from the inside of the door, and/or scrape or brush it out from the inside.  Then, spray with fluid film or the like. 

Compressed air to get the last of the water out, then fluid film.

Use a "Cutting sheet" from the kitchen.  Slide it down the outside of the door glass. Then pull it away from the glass and squirt between the glass and the cutting sheet. this will wash the inside of the door while protecting the felts.

In reply to 44Dwarf :

Oo I like that idea. Anything that means I don't need to take doors off is worth trying, if it ever quits raining. 

If your getting a lot of water in to the door the felts may be damaged or full of pine needles.  When it stops raining you may want to inspect them.  There not a quick or fun job but also not impossible to do , just alott twice as much time as you think it should take.