Can You Mix Windex and Bleach?

Windex and bleach: check for ammonia first

Do not mix Windex and bleach. Windex is sold in several versions. Its FAQ says most of its glass and multi-surface cleaners contain detergents, solvents, fragrance and in some cases ammonia, and it lists Ammonia-Free and Vinegar glass cleaners among its ammonia-free options. If your Windex contains ammonia, mixing it with bleach forms chloramine gas. If it is the Vinegar version, vinegar is an acid, and Poison Control says bleach plus an acid makes chlorine gas. We found no Windex page that addresses mixing with bleach, so confirm the wording on your bottle.

The exposure usually happens by accident. Someone sprays Windex on a mirror, then uses a bleach cleaner in a small bathroom, or wipes bleach off a window with a wet, glass-cleaner-soaked cloth. Fumes can collect quickly in small spaces. Symptoms of chloramine or chlorine exposure include watering eyes, coughing, chest pain and shortness of breath, according to the Washington State Department of Health.

The good news is that glass rarely needs both. A grimy window responds to soap and water, or to Windex alone, and mildew on a hard surface responds to one product used correctly. If you need both, wipe or rinse the first product away completely with water, dry the surface, air out the room, and only then use the second. That is different from mixing, but one product per cleaning job is the safest rule, and it is especially wise in bathrooms.

Cleaning cloths and sponges are an overlooked way for the two to meet. A rag that has held bleach solution can carry residue into the next task, so use separate, labeled cloths, wash them after use, and never store a damp cloth in a closed bucket. Keep spray bottles labeled with the contents so nobody grabs the wrong one.

If they have already met, leave the area, get fresh air, and open windows from a distance. Do not add other products to try to fix the mixture. Call Poison Help at 1-800-222-1222, and call 911 for trouble breathing, chest pain, or collapse.

Where these numbers come from

The formulas and default values in this calculator are based on:

• Windex (SC Johnson), Frequently Asked Questions, and Windex Vinegar Multi-Surface Cleaner product page (SC Johnson Professional)
• Poison Control (National Capital Poison Center), Chlorine gas: Get the facts
• Washington State Department of Health, Dangers of Mixing Bleach with Cleaners
• Clorox, Ammonia and Bleach: Does Bleach Contain Ammonia? Can You Mix Them?
• CDC, Cleaning and Disinfecting with Bleach
• Poison Control (National Capital Poison Center), Need immediate assistance?
• America's Poison Centers, Get Poison Help
• HHS/HRSA Poison Help, What You Can Do. Confirm ingredients on your bottle

This is general household-cleaning guidance and planning math, not medical or professional advice. Product formulas change, so the label on your bottle always wins: follow its directions and warnings, test a hidden spot first, and never mix cleaning products. For a poisoning emergency call Poison Help at 1-800-222-1222 (US), or 911 if someone has trouble breathing.