charging issue

This is weird but I'm my plugging in is getting harder. I'm having to push harder and harder to get the blue handle to plug into the car. Anybody know why or what I need to do? I saw dust on it and cleaned it off but it didn't help.

I now see the question about not clicking on and the response about orings and using wd40. I'll look into that.

 

Thx, but i have already got it working. The orange ring was out of place, having had too much friction. I wd 40d the outside of the car attachment where the blue charger goes on. Someone guessed the orange ring is only to stop moisture. I can't think of any other purpose.