They cleaned the internal and external unit VERY easily. I sprayed it, let it sit for 20 minutes, and then did the same thing again, three times. It even removed dust that had stuck to the plastic part of the external unit. I sprayed it, left it, and as soon as I rinsed it with water, all the dirt came off.

I don't know if the product I bought is defective, but overall its smell is awful, black.
It didn't come with an extension tube, which is a huge issue because as soon as you press it, it becomes foam directly.
Now, as for the cleaning, yes, it does do the job, but what's the point when the air conditioner smells 100 times worse.

The instructions could have been more detailed on the box.

There is no extension tube, so it was not used for the reason it was purchased.
After some time, it was tested on an air conditioning unit. Very difficult to apply. The foam it produces, although rich, does not shoot out, resulting in it not being able to stick to the vertical element of the air conditioner. The foam mostly stayed in my hand.
I have tried others that shoot out just fine and create foam as soon as they touch the surface.

Excellent cleaning spray in foam form, very nice scent, does a really good job in the performance of the air conditioner and is at a very affordable price, compared to the competition. It can be safely applied to the indoor unit, filters, carbon filters, and all parts inside the indoor unit, as well as to the outdoor unit for cleaning.