Mine is pretty clean. I regret not making it bigger thought.
My home in Indiana was custom and my garage was huge. It was always spotless. I bought my home in Texas new so I didn't have any control over it's size.. It's a 3 car but you couldn't get anything else in it if there were 3 cars. Like I said, no basement screws me pretty bad. I'm a serious DIY'er so i have lot of stuff.
My attached 20x22 is pretty clean. Two cars and a pallet for my "compressed wood" bricks that I burn in the winter along with some light yard tools, my generator and garden stuff is in there. My 24x40 shop is a disaster right now. It houses my farm truck, tractor and all of my tools/implements. Since my last truck project I have yet to clean up all of the tools and I have a pending tractor teardown so I don't see a spotless work area anytime soon.