Been using Koh right from the start (before it changed name to Koh). I moved recently and had run out. Decided to try other eco products. Smelt good and low irritant but after trying 2or 3 varieties- they simply did not work. Back to Koh & noticed the difference immediately. If ever I doubted the effectiveness- I’ve proved to myself there is no equal out there to Koh. Hands down the best.