Silicone oil on steel is fine. On a KaBar, engine oil does work. There are some oils that work better on other types of steels, but that is another story.
Most knives designed or meant for military use, like this one, do well with easy to find stuff. Every army has some form of engine oil and grease.
If you have no oil or grease; use a rag and fine sand. Rub the blade until the dirt or stains are removed, and keep it dry. Yes, it will remove the finish and maybe cause small scratches, but it works if you have no other choices.
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