The best treatments are made by Caig Labs for electronics repair and may be bought in small quantities at Radio Shack. Using a brass brush or fine sandpaper, remove the surface corrosion from both sides of the connection. Then apply DeOxIt to the spade connectors and the wire crimps and connect-disconnect several times. Again use the brass brush to remove added oxides. Spray again, apply OxGard conductive grease to the assembly and reconnect. This keeps them in good shape for years, even in salt.
At times, you will have to apply DeOxIt to the crimps and then solder them (usually on the engine grounds) if they are in bad shape.
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