1969 Dodge Dart - Engine Compartment Main Bulkhead Connector

if the de-oxit doesn't clean 'em enough, some more methods
Cleaning bulkhead connectors

To remove the male terminals, they have to be squeezed enough so the barb looks like the one on the right.
When you reinstall, check each one to be sure it will not back out when the connectors are squeezed together.
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The female terminals have a barb on the backs.
If they look like this they are Chrysler style, Packard 58.
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If they look like the ones below, they are Packard 56 series.
Both install the same way. Sometimes they are interchangable. Sometimes not and they won't fit in or they will be too loose in the connector made for the other.
When installing the females make sure the locking tab is raised.
To remove the females, use a flattened cotter pin, tiny screw driver, or the tool they make for it to depress the tab while pushing it out.
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If there is a problem at the crimps, then a crimper for 'open barrel' terminals is needed to fold the wings in properly when replacing.
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(above 2 pics borrowed from civilianjeep bb: BASIC WIRING 101, Getting You Started! - JeepForum.com)