I've had to unplug both pad wear and abs on a Bora I'm changing the wheel bearing on. All the plugs and sockets were gunge inside so I got an aerosol of Halfords Contact Cleaner and holding them pointed down, sprayed up into them and its swilled all the gunge out nicely.
By the way the Halfords Contact Cleaner @ £4 for 500ml is the cheapest I've seen.