good question! ethylene glycol butyl ether, or EGBE, is an ingredient found in many commonly purchased household cleaners. it has no color and acts as a degreaser. there are some studies that show links between exposure to this chemical and fertility problems.
while some companies believe that your potential for hazard is only experienced by the length of time you are exposed to EGBE, method believes in not exposing you to the chemical at all. all of our products are EBGE-free.