Jose, the blind cords are a special hazard. Climbing children should never be allowed to be unsupervised for even one second, and the cords should be raised out of the way. The same goes for strings on jackets, sweaters, hoods, etc. These are all strangulation hazards if they are long enough to wrap even halfway around the neck of a child (imagine the child getting caught between something and the string pressing on the carotid, even if not around the neck). Chas V’sholom.
The dangerous chemical might be Easy Off, Mr. Muscle, St. Moritz, Shumanit(?), or Draino, bleach, Windex, etc. the list goes on and on. Cleaning products of ANY type must be kept on high shelves or in a locked cabinet that is childproof. PERIOD.