When I was younger and had just gotten my 48 Dodge home, my sister found a stray kitten and put him in the garage until she could find a home for him. Well, the rear door to the Dodge was cracked open and the cat decided to poo all over the inside. Same consistency as what that guy had. The only difference is it was cat poo! I'd take dog poo over cat poo any day! Luckily, the interior is vinyl. The bad part is it has the holes in it similar to that other car. I was able to scrub it and get it all out since the holes don't go all the way through the vinyl.