The other way I get rid of clutter is by collecting all the trash in the car whenever I get gas. (And believe me, we collect plenty. And by "we", I mean them.) I keep a little bag for trash in the car, but I don't usually go digging for it in the kids area of the van. I let them do that. So, while gas is pumping into the van, we're all throwing out all the little bits of trash that seem to come out of nowhere.
What do you do to live clutter-free? (or clutter-less)