A person applied oil on his hands in good amount so that there is a barrier layer on the skin. Now his 5 year old child urinated such that the urine spilled on the oily hands of the person. How should the person make the hands paak? Should he first remove oil with soap or is it enough to wash hands 3 times?

You just need to wash your hands to make it paak. You can use soap to cleanse the oil out too.