It left a pleasant fresh scent for 2-3 days and then it's gone. However, after use, that annoying smell has stopped when you put on the air conditioner and the air comes as if it has mold inside! Very good for its money

I bought this specific product, installed it in the air vents, and it caused problems with the radio. The manufacturing company and the representative in Greece should have known and informed about this. So, stay away! I spent 50€ to fix it and it burned circuit boards

It does what it promises..
Cleans odors and dangerous microorganisms from the entire circuit. Leaves a light lemon scent (although not mentioned).
Be careful with the nozzle when entering narrow vents. It may get stuck and remain in the air ducts upon exit.
Sufficient for 2 vehicles or uses.
(remove the cabin filter and then place it back or use a new one)
Recommended!

It's worth its money and it's enough to use it in 2 cars, if it's just for maintenance and not for a car that has never cleaned its A/C and air vents. It leaves a very light scent that is not bothersome.

I used it differently than what the users below write. I consider it completely wrong to fill the air vents since bacteria do not accumulate there as much as in the element, and you don't know where the foam residues can go. I located the drain of the element (with the help of YouTube) and inserted the tube as deep as possible into the drain, and from there I applied foam to the element twice for 20 seconds with a 15-minute wait in between. And then, to clean the air vents, I used cleaning spray again from K2. Now the odors that existed have disappeared.

Easy to use. Large quantity. I filled all the air vents, both on the top and on the legs, and there was some left over.

I really didn't expect it. The result is excellent. You remove the filter and pour the foam inside. You close the filter's lid. Then you pour it into all the air vents, moving from the back of the vent towards the outside. You leave it for 15 minutes to take effect. Then you open the air conditioner at the lowest temperature and the lowest fan speed, gradually increasing the speed while wiping away the foam that comes out. You place the filter back or replace it with a new one. Perfect result!

It is the first product I have tried for car air conditioning and I was completely satisfied. I bought a second one for my wife's car.

Very good product, does what it claims. The air conditioning in my car suddenly started smelling very strong for about a week, until I used this product.
With a little straightening of the attachment/hose, it can penetrate deeper into each air vent. Personally, I removed the cabin filter as the instructions say and put the foam there as well.
Since there was leftover foam, I put it back in the front air vents and noticed that the foam that overflowed (from the first release) was somewhat brown, obviously from dust, dirt, etc.
The strong odor stopped immediately. I also proceeded to change the cabin filter.

It does what it says and mainly disinfects and eliminates unpleasant odors from air vents caused by bacteria. In the first few days, it has a pleasant smell and then the odor is eliminated and the air becomes odorless. Be careful because it will definitely leave liquid behind the dashboard from leaks, so it may cause a short circuit in bare wire contacts. I recommend, in the end, after emptying the entire bottle and the foam is liquefied, to blow air everywhere while the heater is working