I've used the cleaning kit twice so far over the Summer and Autumn period and it seems to work quite well. My a/c was quite filthy as it's in the kitchen/dining area and hadn't been properly cleaned far a few years, so there was quite a lot of grime to remove. The spray on liquid does a good job of removing the majority of the slime however with really dirty units you may need to apply it more than once. I was actually impressed with the quality of the water collection bag as it's a thicker and more durable plastic than I was expecting. Overall I think this is a decent product and once I run out of the cleaning liquid (which should last 3 to 4 cleans) I'll probably be getting some more.