This product is so easy it almost doesn’t seem possible. We got an adolescent puppy who was about 25 pounds so if he has an accident on a rug, it’s a decent sized puddle and can go way down. I am super sensitive and smell it a mile away. Whether you find the accident right away or it’s hidden until it dries and you finally see it, this stuff is amazing. The key is to blot the stain if wet, spray fully until soaked and walk away. If it’s dried already, spray until saturated and leave it. The magic happens after about 12 hours. The hardest part is leaving it alone to dry and do its thing for several hours. It’s not instant. It breaks down the urine and it evaporates with zero residual. It absolutely goes away visibly and with no smell of chemical or anything else. I put my nose to the ground and it’s gone! No scrubbing, just soak and leave it. I would never have believed it because I have tried any and everything through the years with dogs. Tried and true!