People who let rare cars rot.

Rainy Day Auto said
It depends where you live as to how fast and how a car will deteriorate...

I am in a prairie desert, my scrap has less rust than most of the cars in the rust belt, but on the flip side I get sun baked crumbly rubber and plastic pieces.

That said, I am not going to worry about a car with zero rust being outside here. The interior and seals were trash before I bought the car and the metal isn't going anywhere.

Around here you leave the trunk lids open so the air can dry them out after it rains, twice a year.

In the rust belt it will be a far more urgent matter, by having a car outside next to a barn

I wish I had to deal with only crumbly rubber and plastic pieces here in Wisconsin. The winters here eat cars alive.. Wet, slushy snow mixed with salt gets in all the underbody nooks and crannies, then freezes on the cold days. Then melts out, gets all slushy again, freezes again. That constantly pushes all the metal a little farther apart, and combined with the salt, it doesn't take long before a car is unsafe. Coupled with humid summers, Wisco eats cars.