According to TSA and international aviation standards in 2026, bringing cleaning chemicals on a plane is strictly regulated based on the hazardous nature of the substance. Common household chemicals like bleach, ammonia, and chlorine are strictly prohibited in both carry-on and checked luggage because they are corrosive and can pose a significant safety risk in a pressurized cabin. Similarly, flammable liquids like turpentine or heavy-duty paint thinners are banned. However, "passenger-grade" cleaning supplies like disinfecting wipes, small bottles of hand sanitizer (up to 12oz was a temporary limit, but 3.4oz is the 2026 standard for cabin carry-on), and travel-sized non-flammable cleaning sprays are generally allowed. If you are packing laundry detergent or dish soap, these must adhere to the 3-1-1 rule for carry-ons (3.4oz or less in a quart-sized bag). For anything stronger or in larger quantities, it is always safer to buy the items at your destination rather than risk a security seizure or, more importantly, a chemical leak that could damage the aircraft's structural integrity or air quality.