Learning hub
Under Your Sink
Learning hub
This is where the science lives — how surfactants work, what each ingredient does, why some things should never be mixed, and the concepts behind the whole system.
Looking for a recipe to make, or a room-by-room guide? Head to Recipes & Guides instead.
Learning guides
The concepts and chemistry that explain why the recipes work the way they do.
The cleaning formula you need to know How surfactants work in cleaning Soap vs detergent Bleach vs oxygen bleach The crystals behind DIY cleaning Why bicarb and vinegar aren't for everything What is hard water? Do I have it? Why water temperature matters How to thicken water-based products What you need to know about mould Inside the Under Your Sink toolkit
Ingredient guides
What each ingredient is, where it comes from, and why it earns its place under your sink.
Ready to make something?
Browse Recipes & Guides →Under Your Sink · teaching you the system, one recipe at a time.