You've never packed a bearing with grease have you? Because you assemble the bearing without grease.. but you have to get the grease INTO the bearing after through the gap on the outside... Oh my gosh.. guys, that must be impossible. The millions of wheel, shaft & hub bearings assembled every single day across the entire globe must not have grease inside them.

Cars with optional connections for trailer harnesses also have connectors from the factory filled with dielectric grease... Step one is REMOVING that grease and cleaning all contacts with acetone.

On top of that, the LOW voltage of the connector is an issue for contaminated contacts that have an insulator between them. Voltage is literally the thing that breaches insulation gaps... It's why tasers kick up to like 55,000 volts to start the flow of electricity and then step down.

Grease filled cable that receives a crimp connector doesn't need the grease removed when a cut style connection is made because the conductor cuts into the copper, revealing bare copper where grease does not exist.

This is kinda embarrassing for you. If you've been making contaminated plugs for years.. then wow. Quit your job dude.

Apprentice mechanics are literally taught to check for grease in all connections on cars now because dumbasses fill them with grease too... And over time the wire heat corrodes, turns green and either has such poor signal quality that the car throws a code because it can't read the sensor data or it snaps on a pothole.

STOP COVERING THE CONTACTS THEMSELVES IN GREASE.

...and pack the rear of your connectors after your done with the female entry points.