WD -> Water Displacement, designed for a wet job like this, but it does leave a slight oily residue that will tend to attract dirt.

To the OP, for decades I have been sealing all under hood electrical connectors with dielectric grease (aka. ignition lubricant) as was once recommended in a Volvo routine maintenance TSB. I often rinse under the hood and around the engine, sometimes even a soap and water wash. Way back I used to avoid water getting anywhere near ignition components, especially the dizzie, lest I have difficulty starting and a few minutes of hiccups even if I let it dry for a few minutes. Now that I keep things waterproofed, I can spray water almost anywhere under the hood and restart right away with rarely even a hiccup.

The deal is to open up all main connectors (AMM, TPS, IAC, injectors, distrib, plugs, coil, etc.), repacking the female side of the connector with grease, also peeling back the rubber boots to wipe a little underneath the edge to seal the connectors. The only connector listed to avoid was the O2 sensor connector on the firewall, where an anti-oxidant paste is preferred. The low voltage signal from the CPS is another connector I avoid packing, but do grease the boot. The side mounted distributors can still have water splash up under the cap, so that's still an area to avoid spraying directly. The rear cam mount distributors do not have that problem.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now