There are three important stops that you must use to treat a stain, hopefully before it has a chance to set in your carpet:

Apply: Wet a clean white (not printed) paper towel with a cleaning solution. Then dampen the carpet with it. Avoid wetting the carpet through to its backing.

Blot:  Absorb the excess liquid from the carpet by pressing straight down with a clean and dry white paper towel.  Do not rub. Place a half-inch think pad of clean and dry white paper towels with a weight on top and leave overnight if necessary.

Scrape: Gently scrape the soiled area with the blunt edge of a spoon. Scrape from the otside edge of the spot toward the center.