Materials needed to remove oil stains from wooden tables: dish soap, white vinegar, washing powder, and rag.

Step one: Pour an appropriate amount of white vinegar on the table.

Step 2: Pour in a little more washing powder.

Step 3: Apply an appropriate amount of dish soap.

Step 4: Wipe the desktop evenly and repeatedly with a rag several times.

Step 5: After the above steps, the oil stains on the desktop can be removed.