Praise be to Allah, and may Allah’s peace and blessings be upon the Messenger of Allah, his family and his companions.
As to what follows:
In response to your question, we say, and with Allah Almighty lies all success:
If the body has absorbed the grease, then there is no obstacle in performing wudhu. But if there is a layer preventing the contact of water with the skin, then remove the layer before performing wudhu.
Dr. Khalid al-Muslih
11 / 11 / 1424 AH