Hi,

Glad to hear your car is running good enough to take a nice trip.

The answer on how to remove a terminal from a connector socket is to depress a tang down that’s on the terminal inside the housing.
The holes in the connector that the terminals fit into have a certain orientation established by a slot on one side of each pocket. Study the front entry side of the connector.
All the terminals will be align in one direction and are usually numbered on the connector or where it is going to fit.

The metal terminal will have a cutout tab or tang placed on the flat or solid side a the terminal. All of his will up inside and out of sight.
This should be raised or sprung upwards to protrude outwards. It will be higher by about 15 degrees than the rest of the terminal. If not you can lift it with a small knife edge.

When inserted into the connectors pocket backside the tab slides down the groove until it passes a shelf or higher relief area. The slot runs all the way through the pocket to the front.
This is when the tab or tang springs upward to engage in behind the shelf.
This locks the terminal from moving back outwards as the front of the terminal will hit the bottom of the pocket. This is a forward stop.

What you want to do is find yourself or make yourself a narrow and thin probe to slip down the size of that slot from the front. You need make it to slip in the thickness of the gap up and down with a blunt end.
You make it long enough to reach as far as the terminal is long. The tab will be halfway of that.
The tool is usually made out of a paper clip, by grinding or filing, or you can purchase a cheap set small jewelers screwdrivers and reshape them.
As you work the tool in, pull a slight tension on the wire. When you hit the tab or tang down enough it will release the wire.

It’s then you can inspect the terminal for corrosion and shape to be like all the others.
If it is still good you spring the tab or tang back up to it will again tension the terminal in the pocket. Give it a little extra tug to make sure it is locking in. There should be a tiny bit of looseness in the pocket so the pin can align up to the terminal or vice versus.

If you think it a little bit of work you are right. That is why most of the time we don’t remove them and we try to measure voltages or resistances by using the voltmeter probe lead to “Back Probe” the circuit. You just got to make sure you are touch the metal crimps on the wire down in the pocket.

I don’t know what you are looking for but while you have the connector off use some light spray very lightly on the female sides. Push the connector on and off a couple times as this will help clean the terminals with the scrubbing action of them slipping back and forth. I personally like LPS One for this but there are many brands of anti corrosion concoctions out there.
Just keep it to a light film.
Making it Drip can cause problems and is a waste if it’s going everywhere.
Depending on you weather environment doing this about every five to ten years, to the ECU, will keep it tuned up. It’s probably never been done so it cannot hurt!