ValetPro Snow Foam Combo 2 is A high foaming pre wash which produces a thick, clingy film which extends contact time with the surface of the car whilst it works at penetrating grime. As Combo 2 Snow Foam is alkaline based, it’s exceptionally good at emulsifying oil, petrol and diesel stains. This ValetPro product was designed to remove wax layers to aid in full detailing work, so whilst it’s not regarded as wax safe it has great cleaning power with a dilution rate of up to 1:15.