Very easy to use and effective.
The foam it produces leaves a fresh scent and it seems that it really cleans, because the unit’s fins seemed to have become somewhat shiny.
I bought three sprays and cleaned three air conditioners, one 24, one 18, and one 14, using up the two sprays by spraying each unit twice.
I highly recommend it!
P.S. 1. I’d like to make a small recommendation for those who have never cleaned an air conditioner as amateurs, saying that first of all you must absolutely turn off the air conditioner and remove the filters, and the spraying should be done with vertical movements, perpendicular to the fins of the coil, and not horizontally, so that the liquid can penetrate as much as possible between the fins.
If you spray at an angle and horizontally, you will only spray the top surface with zero result.
Also, the plastic filters should only be washed with soapy water; I use Dettol antibacterial and a soft brush.
Especially if the air conditioner is in a kitchen area, it also draws in cooking fumes.
Be careful: before putting them back, they must first be dried well, outside in the sun and air, and not with a compressor, because you may damage them.
P.S. 2. For using the spray, follow only the instructions written on it.

First time I did the process (low-pressure pressure washer & spray), with one spray I barely cleaned 3 indoor units (I had bought 3 packs, so I didn’t hold back). It has a neutral smell, and the units that had developed mold inside seem to have been cleaned quite well. One month later, with daily use for several hours, they remain clean.