What should one do if impure oil has gotten on him and he cannot find soap to remove it, and is there a way to remove its stickiness with water only?

The greasiness of fat can be reduced with dust or similar substances before using water. Al-Buhuti al-Hanbali mentioned in Kashshaf al-Qina' that using something that removes the trace of impurity, like salt or other substances, is good.