Well this was definitely the step that was the most challenging. I had no idea that our cabinet doors had so much invisible grease on them! Our house was built in late 90's and I'm pretty sure these were the original cabinets. If so, then that means there was almost 20 years of grease built up on these doors that had to be removed before painting! Looking back, I should have tried using TSP to remove the grease as it may have worked better than what I chose, but in the end everything worked out just fine. Depending on how many doors you have will obviously determine how long this step will take (I had 19 doors). Either way, take the time needed to do this right and you will not regret it when it is all said and done!