A solids-free liquid defoamer that can be used with a variety of slurries, including light slurries, slurries with retarders, slurries with high yield points, salt-saturated slurries, and latex slurries. VC-AFL does not produce settling that can be found in other defoamer/antifoams of this type. VC-AFL has a low, cold weather pour point and as minimal effect on other parameters such as viscosity, thickening time, compressive strength and fluid loss control. VC-AFL defoamer can be used for slurries encountering downhole temperatures tested up to 500°F.