Jerry, I always wipe the zerks off before pairing the lockNlube to them, not so much to force the grease in, but keeping the gun end paired to the zerk sometimes is an issue with a long-handled gun (not pistol-grip) that takes 2 hands to operate. Everything underneath on this truck is pretty clean and new, to my advantage.
This grease looks to be better for heavy duty and high temp applications. https://www.valvoline.com/our-products/heavy-duty/cerulean-grease



1958 Chevrolet 3600 NAPCO 4x4 Apache
"Calvin"
In the Stovebolt Gallery