Q: What is Bilt Hamber Surfex used for?. Q: How do you use Surfex?. Spray, brush, or pressure wash the solution onto the surface, allow it to dwell briefly, then rinse thoroughly with clean water. A: Surfex-HD is a versatile, water-based cleaner and degreaser for both interior and exterior surfaces, including paint, wheels, tyres, fabrics, carpets, and engine bays.
