Had a friend that kept his cars absolutely spotless. Always washed and waxed, and looked almost new inside and out. His house however was a different story. Two words come to mind: Pure filth!
The kitchen was caked in grease, spilled food, and other filth. The floor which had white linoleum, had turned a deep brown because it was
never cleaned. But those were the good things.
His bathroom -

They used toilet paper, but it seems that after they used it, they threw it in the trash can. Not too bad I suppose, but much of the toilet paper hit the wall prior to entering the trash can, leaving poo streaks on the walls!

ETA: The poo streaks were not cleaned in the 10+ years he lived there - just added to......
But, like I said, he had clean cars