The plug would originally have had a big black plastic cover over the wiring and a metal lever that engages on the socket and pulls the plug tight down when it's flipped over. However yours are missing. Mine is the same, the lever assembly broke and departed some time ago, but so long as the socket is firmly plugged in all the way and held with a cable tie as you have done it should be fine.
Yes, it's fine to spray all the plug pins in contact cleaner, although I doubt this is the problem. While you're in there it's worth making sure that all the individual contacts in the plug are in the correct position and have not "sunk" down into the plug body. If this were the case then it's likely the "sunk" one(s) would be making bad contact, but a thorough visual inspection under a bright light will confirm one way or the other.
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