I was trying to clean my 40 Y/O ones... Not having much luck...
When I came upon a solution...
Go to a Body and Paint facility, and ask for the 3M PPS Paint Caps that they get with each can of paint they use...
Viola!
They slip right into the hole (snugly) and from the top look just the same.
They will keep the "ooze" from off of your "Dzus"!
Installed pix to follow.
Rocky
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