Our guess is Colonel Chemical in the cupboard with the cleaning product label. Household cleaners are regulated by the Consumer Product Safety Commission, a mission mandated by the 1960 Federal Hazardous Substances Labeling Act. That may sound okay, but we beg to disagree. Labels don't have to tell us anything about the many other chemical compounds their products uses. And so they don't.
People use cleaners a little bit at a time over the course of many months or years.
Our contact with the chemicals they contain virtually always comes in tiny increments not the large single exposure addressed by product labels. These small exposures can cause an accumulated build-up of toxins that often won't create any negative health effects until a certain level is reached. In the simplest terms, product labels are only worried about what would happen if you dunked your head in a bucket of a particular product not what happens when you breathe its fumes and get it on your skin once a week for ten years. Manufacturers aren't required to test their products for safety in an independent laboratory before marketing them so many products may have hazards that won't be known until users start reporting them. The best bet when it comes to traditional cleaners is to look for alternatives made from natural ingredients and whose labels offer a full disclosure of all ingredients.