United Kingdom Cliff Switchable Jacks Oxidation Proliferant

these infamous metallurgical UK switching jacks are humbug weathering years of accumulating oxide & severing signal enroute to power amp notoriously used in guitar amplifiers to cut costs to switch by another means (solenoid relay, opto-isolators, mechanical switch).
The guitar amp here is flexwave 65/112 by crate vanished 2018 parts included.

what do i do? emery abrasion the fingerlings? that necessitates removal each fingerling, humbug. they are barbed so u must depress barbs simultaneously yanking them out.

loudtechnologies wants7bucks each plus there's no insulation fibrous washers rear panel anti-earthing isolation gasketing.

why do these fingerlings oxide in the 1st place? is there residual charge left behind for years? or is oxide continuously growing as long as the circuitry is alive with electricity?
 
i believe "chattering" is causing this peck through of the plating covering either brass or phosphorous bronze fingerlings (phosphorous retains its temper resiliency, unbendable).

maybe if we put conductive grease between fingerling tappets this oxide humbug vanishes?

i use this conductive grease on fuser grounding inside hewlett packard laser printers because the fuser heating drum rotates & charge must be removed from rotating drum via leaf spring contact riding rotating drum.

but what if the grease doesn't part when the plug inserted? well maybe the separation gap is large enough to break free the grease bridged across contact fingerlings?