Well,
years ago, in Miami, it was quite common to see washing machines out on a back-stoop, under an awning, with adjacent concrete set-sink. In the old days I guess the old wringer machines were kept ot there and there was no plumbing provisions within the house for an automatic.
The constant passing storms blowing water all over them nearly year-round.
I'm sure they were usually close to the clothes-line, but the hot and humid, salt-air climate did not do the machines any favors. They turned into rust-buckets pretty fast. I recall lots of rotting Speed Queens, and Kenmores.
Even to this day, a drive through the neighborhoods in Hialeah, Coral Gables, and Little Hanvana reveals quite a few machines still located on the back-stoop, rusting away!
I'm thinking the machines in Cuba, back in the day, would have had the same issues. The better homes might have had them indoors, even then, though, the humidity and salt-air would have taken a terrible toll on them.
There might be some hidden treasures somewhere though.
If any group of people could keep them up and running all these years it woud be the Cuban people a very capable and ingenious group of people. Imagine having to invent and machine parts to use for all those old cars!