The directions say to use the cap to pour detergent into machine, however, the cap is not designed for this. Firstly, it's a pop-top, not a typical detergent cap. Secondly, after replacing the cap on the bottle, detergent residue runs from the cap and down the outside of the bottle. A design flaw that is inconvenient enough to prevent me from continual use.

I love love volcano candle, I even have volcano perfume, and now I'm in love with this volcano laundry detergent!! I need less than half the amount of regular detergent since its concentrated, and do the job well done. I had pasta stain on shirt, and I rubbed it directly on shirt before washing, and the stain came off completely. Best of all is the volcano scent from all my clothes, towels, and everything!! It's like you are wearing volcano perfume, but I feel this laundry detergent keep the scent longer than perfume and not overwhelming! This will be my laundry soap from now on!