Tuesday: You can remove set in carpet stains with an iron and a solution of vinegar and water. This takes the concept of a steam cleaner but bare in mind you need to keep changing the towel to soak up the stain. There is no water suction on an iron.
Clean the carpet by putting white vinegar instead of shampoo in the machine. How to Clean Stubborn Carpet Stains with an Iron and Vinegar/Water Solution: Spray carpet with solution. Lay damp cloth over spot. Iron over it with steam iron. Stain is gone