Oxalic Acid Cleaner - Toilet Bowl Cleaner, Removes Stains And Urine Residue. It Can Be Used Frequently For Daily Cleaning. Sodium Sulfate And Urea Accelerate The Dissolution Of Dirt, Improving Cleaning Efficiency. Even Stubborn Stains Can Be Quickly Removed. Saves Time And Effort, With A Simple And Efficient Cleaning Process. Long-Lasting Cleaning Effect, Reducing The Hassle Of Repeated Cleaning.