Lee 
Non-stick pans are consumables. Even treated perfectly they have a finite life, and almost everything that shortens that life comes down to one thing: heat. What the coating is, and where its limit sits Most non-stick coatings are PTFE — polytetrafluoroethylene — a fluoropolymer applied in thin layers and cured onto the pan. It is … Read more
Chemical drain cleaner is the default response to a slow drain and it is usually the wrong one. It is corrosive to pipes and to the person using it, it frequently fails on the blockages people reach for it to solve, and when it fails it leaves a pipe full of caustic liquid that the … Read more
If your dishwasher has started leaving a fine grit on the inside of glasses, or the bottom of the tub smells before you have even opened the door, the filter is the first place to look — and on most machines it has never been touched. This catches people out because of a design change. … Read more
Natural stone is not one material. Granite, marble, travertine, limestone, slate and quartzite behave differently enough that a routine which is fine on one will visibly damage another — and the difference comes down to a single property: whether the stone contains calcium carbonate. The distinction that governs everything Type Stones Reacts to acid? Calcareous … Read more
Down loses its warmth when it is dirty, and most people delay washing a down jacket for years because they are afraid of ruining it. The irony is that the delay is what ruins it: body oils and dirt coat the down clusters, they stop lofting, and a jacket that has lost its loft has … Read more
Ironing damage is almost always a temperature error. Every fibre has a point at which it stops relaxing and starts melting, scorching or glazing, and the dot system on a care label exists to keep you below it. The temperature table Dots Max temp Fabrics Steam One 110 °C / 230 °F Acrylic, nylon, acetate, … Read more
A knife that will not cut is usually not blunt. It is bent. Distinguishing between the two is the single most useful thing to understand about knife maintenance, because the fixes are entirely different and one of them takes fifteen seconds. Honing versus sharpening A knife edge is extremely thin — a few microns at … Read more
What you can do about a scratch depends entirely on how deep it goes and what the floor is made of. The useful first question is not “how do I fix this” but “has it gone through the finish”. Depth test Drag a fingernail lightly across the scratch. Your nail glides over it — the … Read more
The air filter is the cheapest component in a heating and cooling system and the one most likely to cause an expensive failure. A blocked filter starves the system of airflow, and low airflow is the root cause of a long list of faults that get diagnosed as something else. What the filter is actually … Read more
Limescale is calcium carbonate, deposited out of hard water every time it is heated. It does not damage anything quickly, but it insulates heating elements, restricts flow paths, and eventually it starts breaking off in flakes that end up in the cup. The chemistry is simple and it dictates the method: calcium carbonate dissolves in … Read more