Connectors corrosion

You can buy a terminal cleaner in a spray can, do not attempt to clean by hand as you can damage the pins, the spray cleaner will neutralize any corrosion and the conductive lubricant will help prevent further corrosion, also make sure that the rubber weather seal on the plug is in good condition, as for a brand I do not know what you have available, just ask your parts retailer or larger pars outlet and they should know.