WD40? Bad idea. It eats certain plastics for lunch, some right now, and some a year from now.
I'm with mike on this one!
WD-40 Has proven it's worth over the years, for several applications. It has been used by many of us to dry out connectors, wires, distributor components/caps, ignition wires and the like. However, on today cars, some of the plastics do not respond in a kind manor to the application of a solvent like WD-40.
Like Mike has stated, It may take some time to degrade the plastic in the connectors. It will degrade them though. They become brittle, and cracked. In an Emergency, I would not hesitate to use it. when you have time,
other products( Note on the comparison chart The plastic safe category)
This one also , a blow drier or just a rag and compressed air get preferential treatment.
This is the one I use! Still it's not safe on all Plastics. See the chart.
Dom