i need advice on stain removal for a light gray interior.

me and my buddy went to get chinese food in his 2005 mustang convertible and i was sitting in the back and had the bag on the seat and i didnt even consider the fact that sometimes that **** leaks and well....he kinda has a stain now. i guess it would be considered a grease stain?

i feel really bad and bought some stuff at pepboys that has OXY **** in it, but im not sure if its dried or not yet, but apparently it didnt work.

please help! i feel really bad!