yup, I have seen some of that. Dirty? Well, I am thinking LAZY. Maybe so rich that they are used to having people clean up after them.
When I mean lazy, I think of my visits to the destination charger at the Altantis hotel. When finished, some drivers are just too lazy to coil it back up and make sure the connector is off the ground. It is almost always on the ground. During this last winter with the snow and rain, the connector got somewhat corroded and tarnished. I plugged it in and got a warning on my phone that the charge rate was low and to check for a problem. Like 4 mph charge. I unplug it and plug it in again a couple times and finally it goes to the 41 mph that it usually supplies.
Folks, just take 10 seconds to make sure the connector end is not on the ground where rain gets into it.