Most of what's in your cupboards can be fixed, not replaced.
This book tells you which things, in what order, with what you probably already own.
Five things that are true in your kitchen right now
There is a cutting board in your kitchen with a smell in it that a new one won't have for a year.
You own a spray for a problem that a fifteen-cent ingredient already sitting in your pantry would solve in half the time.
There is a drawer with four lids in it that fit nothing you still own.
Something in your bathroom is labeled "antibacterial" and does the same job as the plain version at a third of the price.
You have replaced at least one object in the last two years that only needed forty minutes and not a trip to the store.
Things are designed to be replaced. This book is not.
Most household objects sold in the last twenty years were engineered to a service life shorter than their materials allow, because a shorter service life is a better business model than a longer one. The cleaning products sold to maintain them follow the same logic: fragrance, not function, is what gets repurchased. A lemon scent is not a measurement of clean. It is a decision someone made in a lab, and it works on you whether you notice it or not.
None of this is your fault. You were not taught which nineteen ingredients actually do the work, because there is no profit in you knowing nineteen ingredients. You were taught to buy forty-one products instead. This book is the nineteen ingredients, applied to nine hundred pages of specific objects in your specific rooms, with the chapters organized so you can find the one that matches what is actually broken, stained, dull, or stuck in your house today.
Naomi Nakamura
I started writing these answers down because a friend's mother asked me why her cast iron pan kept rusting, and I realized I didn't have a short answer. That question led to another, and then another, until I had enough of them to organize into a book. This is every answer I've worked out, arranged the way I wish someone had arranged them for me the first year I owned a house.
I am not a chemist and I don't claim to be one. I read the studies, I test the methods in my own kitchen before I write them down, and I tell you plainly when something is a guess.
Six real spreads from the book
Not a mockup, not a cover render. These are pages 44, 118, 231, 402, 560, and 717, exactly as they print. Tap any page to read it full size.
16 parts. 900 pages. Every chapter carries its own page number.
What this book will not do
A book that only tells you what it can do is a book that hasn't been tested on a real house. Here is what it won't.
It will not make your house tidy on its own.
This is a book about caring for objects, not a system for organizing a room. If clutter is the problem, this book solves a different one.
It will not fix an object that is already ruined.
A cutting board split all the way through, a pan warped past flat — some damage is past the point where care helps. The book tells you where that line is, chapter by chapter.
It is not medical advice.
Nothing in these pages diagnoses, treats, or replaces guidance from a physician. Where a method touches health — mold, water damage, air quality — it says so and stops.
About a quarter of its chapters conclude: leave it alone.
Some finishes, some fabrics, some stains are made worse by intervention. The book says so instead of giving you a method to justify its own existence.
It will not work faster than the object allows.
Cast iron needs the seasoning to cure. Grout needs the sealant to set. If a chapter says forty minutes, it means forty minutes — not four.
It will not replace the specific product your appliance manufacturer requires.
Where a warranty depends on a named product, the book tells you that up front, before it tells you the cheaper alternative.
What readers are saying
This book is newly published, so there isn't a long list of reviews yet. Real ones will be added here as they come in — nothing on this page is invented in the meantime.
The full inventory
The launch price ends tonight at midnight. After that it returns to $47 and stays there.
Seven days
If the book isn't useful to you, email support@thereplacementprinciple.com within seven days of your purchase and you'll be refunded in full, no explanation required. Digital delivery means you can read it in full before that window closes.