Rainx is a water-repellant oil. On your windscreen, it makes sense to have water not "wet" the glass, but rather bead-up and run off quickly. In your cooling loop, you want to have the water contacting directly with the metal, not be seperated with a thin layer of oil.
To remove it, you'll need to use some sort of detergent.
By the way, you should be able to remove the pins from a molex connector without any soldering. Look for the little tabs that hold the pins in. Or, splice in some insulated spade connectors for easy change-ups.
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