Apple iFoam is a pH-neutral snow foam, this helps to preserve previously-applied wax or sealant layers, and helps to loosen, soften and remove dirt BEFORE the main wash. This is another step towards eradicating swirl marks from your detailing regime, as there will be less dirt on the panel when you make contact with a mitt or wash sponge.
You can see the dirt removed by checking the thick, white lather turn brown as it pulls dirt from the vehicle
If attempting a contactless wash, please note that a full contactless wash may only be possible if the vehicle is heavily protected, has little contamination on it and is then going to be rinsed with filtered 0ppm water or a contactless drying technique (like an air blower). We don't recommend contactless washes as a general rule, whether snow foam is used or not...
For heavy contamination, use Crudzilla citrus TFR as a far stronger pre-wash