Windmill oiling

Just bought an old windmill and am cleaning it up prior to getting it going.

The previous owners used a grease gun in the oil fitting nipples.

What do I need to do to get the grease out and oil in?

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stupid question but, you are sure he used grease? old heidelberg oil guns looked the same as the grease guns.
if it is grease, not the end of the world. just start using a 10-30 or 10-40 motor oil. it will wash the grease out.