Traffic
Traffic: people search the mark on the paint, not the chemical
Almost nobody wakes up wanting to buy an iron remover. They notice orange specks on white paint, or water spots that will not wipe off, or a haze under the streetlight, and they search a description of what they can see. Detailing brands that publish a proper library of those problems, each page explaining what causes the mark, how to identify it, the safe sequence for removing it and what prevents it coming back, capture the entire top of this category. The products appear inside the method where they belong. Competing on product category terms alone means bidding against every general retailer, while the problem pages face far less competition and bring readers who are ready to act.
