Dettol is a British brand of antiseptic cleaning products made by the brand RB (formerly Reckitt Benckiser). According to Dettol, their products kill more than 99.9% of germs, including bacteria, fungi and viruses. Dettol is not widely available in the U.S., but you can purchase some of the brand's products on sites such as Amazon. The key active ingredient in Dettol is a modified form of the antiseptic phenol, called chloroxylenol BP, according to the Royal Society of Chemistry (RSC). Dettol contains chloroxylenol BP in a 4.8 percent concentration of weight to volume, according to the UK Electronic Medicines Compendium.