Lush invented the bath bomb in the late 80s in a garden shed in England, and we haven't stopped innovating them since. These fizzing, popping tub treats have been a fan favorite for years, thanks to a blend of bold colors, mood-boosting scents and all kinds of fun extras like confetti, plastic-free glitter, secret messages and so much more. But how exactly do you use one? Never fear: the bath bomb is probably one of our easiest-to-master packaging-free products. Just follow the four-step guide below and you'll be on your way to luxurious relaxation.