WD-40 gums up in six months time. Turns into a sticky mess.
Better sprays like contact cleaners and enhancers one could use to spray on.
Another tip is use marine grade heat shrink that has adhesive inside it. It ooozes out the end when hit with a heat gun. This weather seals each connection where it is used. Keeps all the water, humidity. corrosion and dirt out of the connection.
