Does your van have A factory spoiler on the tailgate?
If you look closely at my sig pic you can see mine.

 

Don't all 5th gens have that? the CHMSL is in it.

 

Aerodynamics and the way air flows . Any van minivan hatchback all experience it. Nothing you could do about it

 

certainly worse on my 2011 than was on the 2001. Harder to clean, as well.

 

the shape of the van determines "air swirl". No much can be done there. With that said, in previous years, a spoiler helped. Our 1st gen had an added spoiler to helped keep the back window clean by redirecting air. It helped.

I dont think there are any good looking aftermarket spoilers for the 5th gen. I've seen this....it's kind of ridiculous looking, but it might grow on you?? lol

you could get creative and put a lip spoiler on it....it would take a lot of homework to find one that would actually fit though.

 

It's common on most minivans. I drive on a dirt road to the cottage on the weekend and I know when I get home, the back will be covered in dirt and dust.

 

Maybe you could get a trailer tail?
http://www.atdynamics.com/trailertail.htm

Aerodynamic drag, the vortex left behind vehicles (and the bigger the vehicle, the worse the vortex), is what is sucking dirt up from the road and onto the rear of the vehicle. Short of changing the aerodynamic profile of the van, there is nothing you can do.

 

Maybe you could get a trailer tail?
http://www.atdynamics.com/trailertail.htm

Funny!!!

 

" I've seen this....it's kind of ridiculous looking" Looks more like a hand hold than a spoiler.

 

you mean like this?

Taken after a 30 minute ride down dirt trails near to Lick Wash UT.

So much dust it looked like a pile of snow on the wiper blade..

What did I care, it was a rental

 

I guess you can thank vw for the square design.

 

Which came first, the Routan or the Mopar?
I suspect the latter. Though I do think the DGC we rented had VW character in the interior.

 

VW had no input on the design, which took place in the 05-06 time period. They just came along later and spec-ed a few bits of mascara and lip gloss.

 

it's been a problem

The dusty back has been a problem since day 1 of automobiles