Smells so nice, and it eliminated a strange odor that was in one of my rooms in the basement (I don't have pets). This is my favorite formula. Hint for older carpet: I made a small mixture of this formula with water to clean the edges of the carpet up against the walls (which can't be reached by the machine). I used a small scrub brush and a sponge with straight sides to apply and gently scrub in the solution. Worked perfectly. I used a clean towel to soak up any excess water.