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.It does it's work for which it is made for,I am using harpic since 20 years and I do remember my father used to buy this from the grocery store when I was very young,this brand doesn't need any introduction ,and availability of this on Amazon at such a great price is absolutely fun to buy and makes shopping interesting, whether it's Indian style toilet seat or Western style it just give sparkle to it make it shine without leaving any yellow stains.t needs to be spread out across the surface and allowed to REACT.Vacate the room while its reaction ongoing.I wear slipper and scrub along with water.For spots that dont obey, i used a STEEL WOOL scrub attached to a makeshift handle.This by far is the best product for the purpose. I switched to other alternatives that were cheaper but then realised that the quality is definitely not the same. You may get swayed by cheaper options but don't go for them. This cleans well and easily too.Helpful. Harpic is effective in controlling the stains and odour. Restores orginal spakling appearance with a very little quantity. It is worth the price paid. It leaves a pleasant scent after cleaning.