5/ TREAT STAINS QUICKLY Stains must be treated very quickly to prevent the coating of the leather from being eaten away. Don't delay! If you react quickly you can limit the damage.
Following the instructions:
1/ Dry the stain with a microfiber cloth. Remove as much of the grease as possible,
2/ Cover the stain liberally with talcum powder or another absorbent powder,
3/ Allow the powder to sit on the stain overnight. The powder will draw the grease and moisture out of the leather,
4/In the morning, brush off the powder and the stain should disappear.