My son has just walked bike oil up the stair carpet, how can i (he) clean it off plz?

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Answers:
Grease Stain Removal from Carpet
Try this tip when cleaning carpet stains: Apply a generous layer of baking soda or cornstarch to greasy spots and leave overnight. After vacuuming, the grease should be absorbed. If there is any residue or discoloration left behind, blot with vinegar until the stain is lifted. A dishwashing liquid or detergent specializing in removing grease will also remove carpet stains that are greasy. Make a solution of half detergent and half water and spray directly onto the stain. Blot until the stain is removed. Blot again with a damp sponge to rinse.
Good Luck! =)