As Ric has said, APC or G101 (which is the autosmart version, and cheaper than Meguiars, but also great) is for cleaning. You dilute this with water, and the ratio of water is far higher so it does last a very long time. The nice thing with these products is they can be used for so many different tasks, such as interior, tyres before applying dressing (there is no point applying a dressing to a greasy dirty tyre), exterior rubbers and plastics, cleaning an engine bay that isn't completely covered in oil and grease, door/boot/fuel shuts etc
Spritz is very good for finishing, I also use Poorboys natural look dressing