Handy stuff to have around

[Rifleman]

The last couple M1's I have purchased have had a fair amount of dried cosmoline in the rear sight peep hole and it seems that all my efforts to clean it out where for naught. Anyway I stumbled onto this stuff, it comes in many grits and diameters and is great for cleaning out the peephole for a non-fuzzy () sight picture.

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[Major Tom]

Also, remove the aperature and pour boiling water over it. Boiling water will remove cosmoline in any and all nooks and crannies and evaporates fast so no rust issues.

[bruce]

Never before seen this stuff. Good idea. Thanks! Sincerely. bruce.

[leftyo]

hot water, no need for an abrasive to get rid of cosmoline.

[Sunray]

Mineral spirits is what you use for Cosmoline. Hot water will leave a film. Cosmoline is just petroleum jelly as in grease. Any degreasant will do.

[Rock]

Abrasive?...no thanks

[CPC]

A simple pipe cleaner or toothpick and the above mentioned fluids will thoroughly clean the sight. An abrasive may mar the finish or damage the hole itself. Just my opinion.