It has been almost since it's launch, We are just continuously using this. It can be called as INDIA's No. 1 Toilet Cleaner. Best in this Category till today & almost every Indian uses this only 😁. Works very effectively! Super powerful in removing stains n Germs. Only one con, Due to very powerfulness, The SMELL is really ridiculous! Even there happens a Burning Sensation in the Nise n entire Respiratory Tract! So while using it, Do NOT Close the room/bathroom etc. Make the Area ventilated So that u can inhale the minimal amount of the Acid present inside it.