I bought a new extractor for my M1 carbine and it was packed in cosmoline. I sprayed brake cleaner on it and while it did remove some of it there was plenty left. So I used an old GI trick and boiled some water and set the part in an old metal loaf pan and poured the water in. It came out clean.

The Karma bus always has an empty seat when it comes around.- High Brass

There's battle lines being drawn
Nobody's right if everybody's wrong