If the system has not been cleaned for a long time or if the environment it operates in is humid and dusty, it will not work properly. If it is maintained annually with an air conditioning filter change, it is worth it.

Attention to anyone who uses it, don't make the same mistake as me. At the edge of the hose, there is a plastic piece for better spraying (nozzle)! Before using it, remove this plastic so as not to damage the air conditioning system and avoid having to remove the entire dashboard. In my case, the nozzle remained inside the air conditioning system when I first used it, and it was difficult to remove! I wonder why such a company didn't make it one piece, it easily comes off the hose. It contains a very small quantity! I barely sprayed it on the evaporator and it was gone, without producing much foam, it's not enough to clean the air vents. There is a German product with double the quantity at half the price (with good reviews on skroutz). After using it in the car, I didn't notice any difference in the air conditioning... wasted money.

It does what it promises. No more bad smells from the car air conditioner. Perhaps the only negative is that it is not in foam form but in spray form, resulting in the optimal cleaning of the AC element not being possible, because you spray the spray blindly (at least in my car, the element is not visible-accessible) unlike a foam spray which expands upon spraying and thus logically covers-disinfects the entire element. However, the result was definitely effective!