What car vacuum cleaner works best?

I have a large family and my car becomes dirty almost immediately!
Don't know what to do :uhoh:

Assuming you're not willing to change out your family, what other limitations do you have? Are you looking for something corded or cordless? Are you needing it to pick up everything from napkins to full pretzels, or are you willing to pick up the large chunks of recognizable material first, leaving only pretty small stuff for the vacuum?

-Rod