As mike says if it has penetrated the backing it will need more than a normal clean. In fact a regular clean may make matters worse by adding moisture to the bacteria.
If it is a larger spill the procedure I would follow is to flood the area with Craftex pre enzyme pre spray, literally poring it on with a jug, let it dwell for 15 mins then extract with a water claw. Flood the area with water and extract with a water claw repeatedly until all of the residue has been extracted. Then clean the carpet as normal. You can get all of that equipment at restormate.