The quickest method I have found is a slight adaption of the above guide.
1. Wet with ultra clean (as a foam) - basically cover the grease in foam and let it soak in.
2. Spray a small amount of alcohol cleaner onto the disipating foam and then massage into the leather with your fingers. Apply more ultra clean foam and continue to massage.
3. Keep the leather soaked over a 5 minutes period and then extract the solution from the leather.
You find that as you extract the solution the leather starts to lighten as it dries.
4. After about 5-10 minutes of extraction, apply a coat of leather degreaser and allow to dry.
What I have found is that when using the extractor, small pockets of grease may resurface, so instead of wetting the leather again and extracting that area, it is quicker to use the degreaser, and then brush it off. This also makes the leather dry out quicker so that you can apply the re-colouring balm sooner.