It was kind of difficult to use, since my fogger does not have an external tube, and you'll only need a tiny bit of the cleaning fluid. I made it work by first pouring out the fog fluid, poured in the cleaning fluid, ran the fogger, and then poured out the excess fluid (about 90% of the fluid I initially poured in).
The fogger runs much smoother now, and doesn't spit like it used to earlier.
Really nice product!