Okay, so first know that you don't have to purchase the book, but it definitely will help you to follow the challenge. Second that the idea of the challenge isn't really about always having a spotless home per se, but more about examining our hearts and growing in our understanding of how keeping a home is glorifying to God.
Each day has a Mary and a Martha challenge.
Day One's Mary challenge is to as the question, "Why do you want a clean home?" and to come up with a mission statement. This is to keep you motivated to be consistent (the main problem I have). You are to place it where you can read it each day and it should take you no more than a minute to read it. I am long winded in everything I write or say, so here are my reasons. I've written them for our family, mostly in the hopes that I can teach these to our children. I call them my Dirty Dozen (I wasn't aiming for twelve, it just came out that way).
1. We clean to honor God by being good stewards with what He has given us and showing our gratitude for it.
2. We clean to honor our husband/father by making and keeping our home a welcoming and restful place.
3. We clean to be an example of productivity and stewardship to each other and to others outside of our home.
4. We clean to practice self-discipline.
5. We clean to practice self-denial.
6. We clean for the sake of cleanliness, sanitation, and sanity.
7. We clean to serve others, and not just those in our family, but also our guests.
8. We clean to keep from falling into the temptations of being slothful,
laziness, and idleness.
9. We clean to keep things orderly and create a beauty in our home reflective of God's order and beauty in creation.
10. We clean to keep things where we can find them easily.
11. We clean to reduce stress, anger, and frustration.
12. We clean so that we may truly set aside a time of rest from our work.
Day One's Martha challenge is to gather supplies. Oh yeah, I've got that one down ; )