Mix 1 part Vanish with 9 parts cool water (max temperature 40˚) and whisk the solution into a foam.
Apply the foam evenly using a clean colourfast brush or sponge. Do not make the carpet overly wet. Allow to dry and simply vacuum away.
For isolated stains:
Using the cap pour vanish onto the stain. Leave for 5 minutes and then just gently rub away with a clean, damp, colourfast cloth.