I give it a 5 because as far as cleaning power goes....it's 100%. It will definitely get your floors clean. However, the smell is over-the-top, in your face horrendous. Years ago, I used to take care of a blind man and this is the only thing he wanted me to mop the floors with. The very first time I used it, I accidently used too much and it was overwhelming and the stench stayed in the house for days. Even using a drop of it in a full gallon of water is still overwhelming. And heaven help you if you spill some on your hands or clothes...especially if it's undiluted. I don't think the smell would ever come out of clothes if you got it on you when it's undiluted. I know that it took a couple of days for my hands to stop smelling when I got some on me, and it took a couple of rounds in the washer to get it out of clothes, and that was when it was diluted! You can smell it through the bottle, with the lid tightly closed, that's how potent it truly is.