Good to hear. I'm getting sick to goddamn death of all the large compact
vehicles and small full-sizers on the road.

Well, yeah, once a dirty crook, always a dirty crook, generally.

A good supply of quarters. That's not gonna work for you, though, on
account of all them crooks.

The nooks and crannies of cars are just made to hold bits of leaves,
the little paper thing that comes off the end of a straw, stray
pennies, crumbs of whatever you were eating, etc.  A household vacuum
cleaner with the smallest and cleverest "crevice tools" that go on the
end of the hose is a big help.

There might be some 12V car vacs now that provide both the right tools
and a useful amount of suction but it isn't a market I'm familiar with.

Refraining from eating in the car helps even more.  (Let's not even
talk about smoking except encouragement to quit.)  Food crumbs and bits
of food wrappings just naturally make things worse.  If you have kids,
well, good luck.

Oh, yes, and good floor mats are a big help.  The quicker they start to
look dirty, the better the job they're doing!  Frankly, I like the
sport-ute ones that can actually contain about a quarter inch of water
and mud and whatnot until such time as you can (carefully) lift them
out and dump them.  Better there than on the carpet...

There are all sorts of back-of-seat and console and inside-the-trunk
organizers, so shop around and see what fits your car and your usage
scenario.    An organizer that you never use because it isn't quite
suit the need is just more clutter in its own right.  

Cheers,
--Joe

For dust on the dash you might consider a small (2 inch)
paint brush.