Children can be sensitive to the chemicals in everyday cleaning products, especially if they have allergies or asthma. Household cleaning products can add to indoor air pollution and leave residues on surfaces. The strong chemicals in cleaning products often provide far more cleaning power than what is needed.  Products that are poisonous or corrosive (can burn holes in clothes and eat away layers of skin) are marked with hazard symbols. But these warnings are only used for the most dangerous ingredients. Many other chemicals aren't as toxic but have rarely been fully tested for safety (for long-term, low-level, and multiple-exposures). Safer alternatives are often available.