Electric car charger issue.?

That's the problem with actual physical conductive connections and to make matters worse, problems with one end will tend to damage the other end physically in some way so though you may believe there's nothing wrong with the car end, there probably will be in short order if you don't get the first one fixed. When GM came out with the EV-1, they used an inductive paddle ( no physical connection ), that would've been a superior choice but once Californian politicians got involved in selecting a public standard, reason went out the door. Of course, part of the reason for a less than satisfactory choice was to avoid favoring one manufacturer over another.

But at least they picked a standard or at least we think they did.

An electric car is an automobile that is propelled by one or more electric motor ... with fast chargers available along highways at a ...

I don't think you should try to clean it. Especially because it may be broken and not just dirty. Have an electrician look at it.