Grease Stains:
Use a product specifically designed to treat grease stains. Warm water alone won't remove the grease. It could be a good idea to test the product on a small area of the tufted carpet first to see if it causes any decolorization.
Use a piece of cotton wool and apply to the edges of the stain, working inwards.
Blot with absorbent tissue or paper towel. The carpet may darken during this process, but this should disappear afterward.
Dampen the area with a diluted soap solution to remove any cleaning product residue.
Blot with tissue or paper towel.
Dry the area with a hair-dryer, moving continuously over the stain, to avoid watermarking.
Repeat this process if the stain is not entirely gone.