If you like a rich lather, we recommend that buyers use a professional car wash soap to wash your car.iMountek High Pressure Car Washer Gun comes with 1/4in outlet quick disconnect fitting and Metric M22-14mm inner connector, which can be connected with nozzles, extension wand, foam cannon, etc. Easy to install and remove.Put some liquid soap and water to a ratio of you like in the bottle to thicken the foam. Then connect the 1/4" quick connect plug to the pressure washer gun. Adjustable nozzle for precise mixing and foam generation.Turn the top knob right/off to get the thickest mixture and adjust the nozzle to get the right jet pattern.Car Washing, floors,Windows washing Driveways Roofs Siding washing and so on Ideal for enthusiast or professional use.