You might have used lots of detergents, liquids and god knows what else just to get rid of grease stains. Tell you the trick. Just rub the part which has grease stains with chalk ad just do a normal wash. Comment your results:)
I had some stains on my bathroom as well as kitchen tiles. ‘I dipped a wet sponge in lime water and rubbed it on the stain. Woah! It went away. Alternatively bleaching powder or baking soda can also be used.